Thank You for Your Service! Two Decades and 289 Chairs at ACM RecSys
The first post in this series looked at who runs the ACM Conference on Recommender Systems (ACM RecSys), and how the conference changed as an organisation. The annual committee grew, responsibilities became more differentiated, and recent conferences moved work from individual Chairs to teams.
This post turns to the people: who keeps showing up, and what does repeated service actually consist of? I created a dataset with 289 people who have held, or are already announced to hold, at least one recorded ACM RecSys chair position such as General Chair, Program Chair, or Tutorial Chair. Together, they account for 568 ACM RecSys roles from 2007 through 2026, and in part 2027. Of those 289 people, 180 appear exactly once at ACM RecSys, and only 25 have at least five recorded ACM RecSys roles. For the same 289 people, I also collected chair positions at six neighbouring conference series: ACM SIGIR, ACM UMAP, The ACM Web Conference, ACM WSDM, ACM CIKM, and ECIR. That adds 361 roles, giving 929 recorded conference-chair positions in total.
The title is meant sincerely for all 289. Serving once is service too. I focus on the smaller group who returned because repetition allows patterns to become visible that a single role cannot show.
“Thank you for your service” is most strongly associated, especially in the United States, with military service. I borrow the phrase deliberately here for something very different: service to a scientific community. Academic communities are not countries, and organising a conference is obviously nothing like military service. Academic communities nevertheless depend on people taking responsibility for institutions whose benefits are shared by many who may never see most of the work. Conference organisation is one form of what is sometimes called academic citizenship.
Chair positions are only one visible part of that work. Reviewers, volunteers, staff, editors, software maintainers, teachers, and many others contribute without appearing on an organising page. The spreadsheet measures one narrower thing: repeated chair service.
I use three counts below. ACM RecSys counts chair roles at the dedicated conference. Other counts roles at the six neighbouring conference series, but only for people who already enter the population through ACM RecSys. Total combines the two.
I also distinguish between two time periods: the full 2007–2027 record and a recent window beginning in 2020. I use 2020 because that is roughly where the previous post found the organisation changing shape: committees grew sharply and responsibilities increasingly moved from individuals to teams. The ACM RecSys person-level record runs to 2027, but only the three announced General Chair positions exist for that edition; measures that require a complete edition stop at 2026.
A high count does not mean that someone is a better researcher, more influential, or more important to the field. Nor do all chair positions represent the same kind of work. Each recorded chair position simply adds one to the spreadsheet.
Disclosure: I am in the dataset myself, with one recorded ACM RecSys chair role as General Co-Chair of the 2027 edition, and I sit on the current ACM RecSys Steering Committee. I keep myself out of the examples below. Including the announced 2027 roles is the sole reason I am in the dataset at all; without them it contains 288 people. A role that has been announced and staffed is a real commitment. I also could not resist.
Table of Contents
1. Who keeps coming back?
The most direct question is who repeatedly takes responsibility for ACM RecSys itself. I therefore start with the ACM RecSys record rather than with the combined seven-conference ranking. The table uses a threshold rather than a fixed Top-N cut: everyone with at least five recorded ACM RecSys chair roles is included.
| Rank | Person | ACM RecSys roles | Other roles | Total | ACM RecSys first–last |
|---|---|---|---|---|---|
| 1 | Li Chen | 11 | 5 | 16 | 2010–2026 |
| 2 | Alan Said | 9 | 6 | 15 | 2012–2023 |
| 3 | Benedikt Loepp | 8 | 1 | 9 | 2015–2022 |
| 3 | Sole Pera | 8 | 9 | 17 | 2018–2026 |
| 5 | Bart Knijnenburg | 7 | 5 | 12 | 2014–2026 |
| 5 | Ludovico Boratto | 7 | 9 | 16 | 2020–2026 |
| 5 | Michael Ekstrand | 7 | 3 | 10 | 2012–2026 |
| 5 | Saikishore Kalloori | 7 | 0 | 7 | 2020–2026 |
| 9 | Alexander Tuzhilin | 6 | 1 | 7 | 2009–2026 |
| 9 | Dietmar Jannach | 6 | 7 | 13 | 2010–2023 |
| 9 | Francesco Ricci | 6 | 2 | 8 | 2007–2017 |
| 9 | Hanna Hauptmann | 6 | 2 | 8 | 2021–2023 |
| 9 | Humberto Corona | 6 | 0 | 6 | 2018–2022 |
| 9 | Joseph A. Konstan | 6 | 1 | 7 | 2007–2026 |
| 9 | Pearl Pu | 6 | 1 | 7 | 2007–2017 |
| 9 | Tao Ye | 6 | 4 | 10 | 2018–2026 |
| 17 | Alexander Felfernig | 5 | 1 | 6 | 2007–2014 |
| 17 | Cataldo Musto | 5 | 5 | 10 | 2019–2025 |
| 17 | Christoph Trattner | 5 | 4 | 9 | 2017–2024 |
| 17 | Martijn Willemsen | 5 | 2 | 7 | 2016–2026 |
| 17 | Noemi Mauro | 5 | 7 | 12 | 2021–2026 |
| 17 | Pablo Castells | 5 | 3 | 8 | 2015–2024 |
| 17 | Paolo Cremonesi | 5 | 2 | 7 | 2013–2022 |
| 17 | Shlomo Berkovsky | 5 | 3 | 8 | 2011–2023 |
| 17 | Özlem Özgöbek | 5 | 0 | 5 | 2021–2025 |
Long-term and broad service
Li Chen leads the ACM RecSys count with eleven roles across seventeen years. Chen begins with liaison work in 2010–2012, then moves through local organisation, demos and tutorials to Program Chair in 2020 and General Chair in 2023, followed by Women’s Events and workshops. Together with Dietmar Jannach, she is the founding Co-Editor-in-Chief of ACM Transactions on Recommender Systems (ACM TORS).
Alan Said’s nine ACM RecSys roles begin with Publicity, then move through Workshops and Industry to General Chair in 2019, followed by Reproducibility and Tutorials. Said now chairs the ACM RecSys Steering Committee. His six recorded Other roles include ACM UMAP General Chair in 2026 and a Web Conference 2026 Track Chair role in User Modeling, Personalization and Recommendation.
Michael Ekstrand’s seven ACM RecSys roles include Demo/LBR, General Chair in 2018, Program Chair in 2022, two doctoral roles, and Reproducibility. Ekstrand sits on the Steering Committee’s Executive Committee and the ACM TORS editorial board, has been central to LensKit, and teaches the Coursera Recommender Systems Specialization with Joseph A. Konstan.
Joseph A. Konstan’s six ACM RecSys roles span almost the full history of the conference: General Chair in 2007 and again in 2026, with Doctoral, Workshop, and Program Chair roles between them. Konstan also chaired the ACM RecSys Steering Committee from 2007 to 2009. In 2022, ACM gave Konstan the Outstanding Contribution to ACM Award for twenty-five years of service and leadership.
Martijn Willemsen’s five ACM RecSys roles run from the doctoral symposium in 2016 through General Chair in 2021 to Tutorial, Workshop, and Program Chair roles in 2024–2026.
Alexander Tuzhilin’s six ACM RecSys roles stretch from General Chair in 2009 through Program Chair in 2017 to Doctoral Chair in 2026.
Benedikt Loepp’s eight ACM RecSys roles are much more specialised. Six are consecutive Web/Media Chair positions from 2015 through 2020, followed by Student Chair and Proceedings Chair. Chen provides the useful contrast: her recurrence comes from moving through much of the organisation, while Loepp’s comes largely from repeatedly taking responsibility for one operational function.
Same totals, different tempo
Counts also hide time. The same number of roles can be concentrated in a short span or distributed over much of a career. As a simple measure of service density, I divide each person’s seven-conference role count by the inclusive span from the first to the last recorded role.
| Person | Total roles | First year | Last year | Service span | Roles per service-span year |
|---|---|---|---|---|---|
| Ludovico Boratto | 16 | 2020 | 2026 | 7 | 2.29 |
| Li Chen | 16 | 2010 | 2026 | 17 | 0.94 |
| Alejandro Bellogín | 11 | 2016 | 2026 | 11 | 1.00 |
| Bamshad Mobasher | 11 | 2008 | 2027 | 20 | 0.55 |
| Hanna Hauptmann | 8 | 2021 | 2024 | 4 | 2.00 |
| Shlomo Berkovsky | 8 | 2011 | 2025 | 15 | 0.53 |
Boratto and Chen both have sixteen recorded roles, accumulated across seven and seventeen years respectively. Hauptmann and Berkovsky both have eight, across four and fifteen years. Among the 27 researchers with at least eight total roles in the combined ranking in the appendix, the density ranges from 2.29 to 0.50 roles per service-span year.
Bamshad Mobasher sits near the sparse end. His eleven recorded roles run from 2008 through an announced return as ACM RecSys General Chair in 2027, with seven ACM UMAP roles in between, including Program Chair in 2012. Mobasher chaired the ACM RecSys Steering Committee from 2020 to 2023.
2. Repeated service since 2020
The full record shows long-term recurrence. The recent window asks a different question: what does repeated service look like in the larger modern ACM RecSys organisation?
| Year | Ludovico Boratto | Saikishore Kalloori |
|---|---|---|
| 2020 | Demo/LBR | Students |
| 2021 | Demo/LBR | Challenge |
| 2022 | Demo/LBR | Challenge |
| 2023 | Workshops | Finance & Registration |
| 2024 | Doctoral | Finance & Registration |
| 2025 | Workshops | Finance & Registration |
| 2026 | Reproducibility | Finance & Registration |
Ludovico Boratto and Saikishore Kalloori each have seven ACM RecSys chair roles since 2020, but the similarity ends with the count. Boratto rotates through Demo/LBR, Workshops, the doctoral symposium, and Reproducibility. His nine recorded Other roles include General Chair of ACM UMAP in both 2022 and 2024; he also co-organised the 2024 RecSys Summer School in Bari with Cataldo Musto and Fedelucio Narducci.
Kalloori’s seven roles are entirely at ACM RecSys: Students in 2020, Challenge in 2021 and 2022, and four consecutive years of Finance and Registration from 2023 through 2026. Try running a conference without them.
Sole Pera has eight ACM RecSys roles overall, six of them since 2020, covering Inclusion and Accessibility, the doctoral symposium, Women’s Events, and Program Chair after an earlier General Chair role in 2018. Outside ACM RecSys, Pera was Program Chair of ACM UMAP 2023 and ACM CIKM 2024. She sits on the Steering Committee’s Executive Committee and co-chaired the 2025 ACM Europe School on Recommender Systems in Vienna with Julia Neidhardt and Wolfgang Wörndl.
Noemi Mauro’s entire twelve-role record begins in 2021. Mauro has five ACM RecSys roles spanning Proceedings, Tutorials, Student activities, and Publicity, alongside seven ACM UMAP roles over the same six-year period.
Özlem Özgöbek held four consecutive Women’s Events roles from 2021 through 2024 and the doctoral symposium in 2025.
Hanna Hauptmann’s six ACM RecSys roles are more concentrated still. Hauptmann handled Women’s Events and Publicity simultaneously in 2021, 2022, and 2023. Six roles do not necessarily mean six editions: in Hauptmann’s case, they mean three editions with two parallel responsibilities.
3. Is there a path to General Chair?
Forty-five people have held, or are already announced to hold, an ACM RecSys General Chair position in the 2007–2027 record. Twenty-three had no earlier recorded ACM RecSys chair position before their first appointment.
Among the remaining 22, Program Chair was the most common most recent recorded ACM RecSys role before first becoming General Chair: seven cases. Five most recently came from the doctoral symposium. Ten had been Program Chair at some earlier point. For these 22 people, the median gap from the first recorded ACM RecSys chair role to the first General Chair appointment is five and a half years, with a range from one to fifteen.
| Most recent recorded ACM RecSys role before first General Chair appointment | People |
|---|---|
| No earlier ACM RecSys chair role at all | 23 |
| Program Chair | 7 |
| Doctoral Chair | 5 |
| Industry Chair | 2 |
| Publicity Chair | 2 |
| Workshop Chair | 2 |
| Demo/LBR Chair | 1 |
| Inclusion & Accessibility Chair | 1 |
| Short Paper Chair | 1 |
| Tutorial Chair | 1 |
| Total | 45 |
Robin Burke went from ACM RecSys Program Chair in 2009 to General Chair in 2011, then returned for the doctoral symposium in 2017 and Reproducibility in 2024. At ACM UMAP, Burke was Tutorial Chair in 2014, Doctoral Chair in 2015, and Program Chair in 2020; he chaired the ACM RecSys Steering Committee from 2017 to 2020.
Toine Bogers’ first recorded ACM RecSys chair position is General Chair in 2019, followed by Social Chair in 2020; his next recorded chair role in the seven-conference dataset is ACM UMAP General Chair in 2026. Bogers is also a current ACM RecSys Steering Committee member.
George Karypis follows the more familiar Program-to-General sequence, from Program Chair in 2013 to General Chair in 2026.
The aggregate result is nevertheless clear: there is no standard ladder to General Chair, and for 23 of the 45 people General Chair is the first ACM RecSys chair role I can identify.
4. ACM RecSys in a wider conference ecosystem
The six neighbouring conference series provide a second view of the same ACM RecSys-defined population.
More visible outside ACM RecSys
Min Zhang has one recorded ACM RecSys chair role, Program Chair in 2023, but thirteen roles at the six neighbouring conference series. Her ACM SIGIR sequence runs from Short Paper Chair in 2018 through Best Paper and Track roles to Program Chair in 2026; she has served as Editor-in-Chief of ACM Transactions on Information Systems since 2020 and is completing her second and final term in 2026.
Alejandro Bellogín has four recorded ACM RecSys roles and seven at neighbouring conferences, eleven in total. Bellogín first appears in the ACM RecSys record as Proceedings Chair in 2016 and later takes Workshop and Tutorial roles, while the wider record is dominated by ACM UMAP, including General Chair in 2022 and Program Chair in 2026.
Marko Tkalčič has three recorded ACM RecSys roles and seven outside it. Tkalčič’s ACM RecSys roles are Workshop Chair and two Demo/LBR positions, while his wider activity is concentrated at ACM UMAP, including Program Chair in 2021, several Track Chair roles, and the doctoral symposium in 2026.
Hui Fang has one recorded ACM RecSys chair role and ten roles at the neighbouring conference series.
Maria Maistro has two ACM RecSys roles but seven wider roles since 2020, including General Chair of ACM SIGIR 2025. With Bogers and Said, she co-organised the 2023 RecSys Summer School in Copenhagen. Tat-Seng Chua has one recorded ACM RecSys role and six at neighbouring conferences, including General Chair of ACM SIGIR in 2008 and ACM WSDM in 2023.
Organisers across conference series
| Where the record begins | People |
|---|---|
| ACM RecSys only, no roles elsewhere | 178 |
| First recorded chair role at ACM RecSys, later elsewhere | 57 |
| First recorded chair role at a neighbouring conference, later at ACM RecSys | 44 |
| First recorded chair roles on both sides in the same year | 10 |
| Total | 289 |
Peter Brusilovsky’s wider record begins a decade before his ACM RecSys chair record. Brusilovsky first appears at ACM UMAP as Industry Chair in 2009, followed by the doctoral symposium in 2011 and Track Chair roles in 2017, 2018, and 2022; his only recorded ACM RecSys chair role is Program Chair in 2019.
Marco de Gemmis likewise first appears at ACM UMAP, as Doctoral Chair in 2013, before ACM RecSys Proceedings Chair in 2015 and later Doctoral and Program Chair roles at ACM RecSys.
Rodrygo Santos has one ACM RecSys chair role, General Chair in 2020, and seven further roles across ACM CIKM, ACM WSDM, ACM SIGIR, and ACM UMAP. Those include CIKM Program Chair in 2023 and SIGIR Tutorial Chair in 2021 and 2025. Santos is also a current ACM RecSys Steering Committee member. Thirty-four people appear in at least three of the seven conference series; only three — Hui Fang, Vanessa Murdock, and Rodrygo Santos — reach five.
Substantial activity on both sides
The Total view adds ACM RecSys and the six neighbouring conference series. It surfaces people whose service is substantial on both sides without necessarily dominating either separate ranking.
Dietmar Jannach has six recorded ACM RecSys roles, spanning Workshops, Program Chair, Tutorials, the doctoral symposium, and Reproducibility, plus seven roles at neighbouring conferences, mostly ACM UMAP, where he was Program Chair in 2019. Jannach co-founded ACM TORS in 2022 and is Co-Editor-in-Chief with Chen; he also co-authored Recommender Systems: An Introduction with Markus Zanker, Alexander Felfernig, and Gerhard Friedrich.
Christine Bauer has seven recorded roles since 2021, split three at ACM RecSys and four at neighbouring conferences, and is announced as an ACM RecSys General Chair for 2027. Bauer’s public portfolio also documents extensive meta-reviewing, reviewing, editorial, and teaching work across venues including SIGIR, RecSys, CHI, ISMIR, TORS, TOIS, and summer schools.
5. What the counts miss
So far, I have treated the dataset as a way of making repeated service visible. It is equally important to ask what each measurement choice hides. The people below are a selection: I chose cases where the gap between the chair count and the broader record seemed particularly informative, and another selection could reasonably look different. Research achievements mentioned in these examples are context, not additional service points.
What “since 2020” leaves behind
| Person | ACM RecSys roles overall | Since 2020 | First and later recorded roles |
|---|---|---|---|
| Francesco Ricci | 6 | 0 | Doctoral consortium 2007; General Chair 2017 |
| Pearl Pu | 6 | 0 | Short Papers 2007; General Chair 2008 |
| Alexander Felfernig | 5 | 0 | Liaison 2007; Program Chair 2009 |
Francesco Ricci’s six ACM RecSys chair roles run from the doctoral consortium in 2007 to General Chair in 2017. Ricci chaired the ACM RecSys Steering Committee from 2009 to 2011, remains a current member, serves as an ACM TORS Associate Editor, and is an editor of the Recommender Systems Handbook. The recent chair column records a zero; his Steering Committee, editorial, and handbook work would not enter either chair column in the first place.
Pearl Pu’s six ACM RecSys chair roles also all predate 2020, beginning with Short Papers in 2007 and including General Chair in 2008. She also served on the ACM RecSys Steering Committee from 2008 through 2025.
Alexander Felfernig has five recorded ACM RecSys chair roles, from Liaison in 2007 through Program Chair in 2009 and later Tutorial and Workshop roles, all before the recent window.
“Since 2020” measures recent activity, not lifetime contribution.
Low counts, larger institutional contributions
Paul Resnick has two recorded ACM RecSys chair positions, in 2009 and 2010, but served on the Steering Committee from 2010 to 2017 and chaired it from 2013 to 2015. John Riedl, who died in 2013, had three recorded ACM RecSys roles, including Research Program Co-Chair of the first conference in 2007. Both were members of the GroupLens team whose collaborative-filtering recommender systems received the ACM Software System Award in 2010; Resnick later wrote the 1997 Communications of the ACM article Recommender Systems with Hal Varian and has written his own history of that work.
Derek Bridge appears once in the chair dataset, as Short Paper Chair in 2008. Bridge’s own service record identifies him as a co-founder of the ACM Conference on Recommender Systems and documents his long Steering Committee and Senior Program Committee service.
Lars Schmidt-Thieme and Zeno Gantner each have one recorded ACM RecSys chair role. Schmidt-Thieme served on the Steering Committee from 2009 to 2016. In 2009, Steffen Rendle, Christoph Freudenthaler, Gantner, and Schmidt-Thieme published BPR; Gantner later helped develop MyMediaLite, and ACM TORS lists him as a Distinguished Reviewer.
Outside the chair-defined population
A chair-defined population can also exclude people altogether. In the August 2026 Steering Committee snapshot used here, 45 unique current members remain. Twenty-two have no more than two recorded ACM RecSys chair roles, eleven have exactly one, and Emilia Gómez and Alípio Jorge have none.
Gómez and Jorge nevertheless have substantial institutional histories outside the chair-defined RecSys population. Gómez served as President of the International Society for Music Information Retrieval in 2018–2019. Jorge co-chaired ECML/PKDD 2015, along with other machine-learning and data-mining conferences.
Mounia Lalmas shows the population boundary from another direction. Lalmas is not in the 289-person dataset because she has no recorded ACM RecSys chair role, yet her official RecSys 2024 keynote biography lists co-chair roles at SIGIR 2015, WWW 2018, WSDM 2020, and CIKM 2023; she also delivered a keynote at ACM RecSys 2024. Lalmas currently co-chairs the WSDM Steering Committee, and in 2026 the University of Gothenburg appointed her an honorary doctor at its Faculty of Science and Technology with a focus on recommender systems. Her absence from the Other rankings is therefore a direct consequence of how I defined the population, not evidence of little conference service.
The Other tables answer a specific question: which people from the ACM RecSys chair population also organise the six neighbouring conference series? They are not rankings of the most active organisers of those conferences.
Service without chair titles
Even the Overall and Total columns count only conference-chair roles.
Barry Smyth’s entire ACM RecSys chair record is Research Program Co-Chair in 2007. Smyth remains on the Steering Committee and has repeatedly served on Senior Program Committees; Smyth’s profile also describes how his work connected recommender-systems research to practice through ChangingWorlds and HeyStaks.
Bart Goethals currently has one ACM RecSys chair row: Program Chair in 2026. Goethals is also an ACM TORS Associate Editor, co-created the open-source RecPack experimentation toolkit with Lien Michiels and Robin Verachtert, and co-founded Froomle. Goethals also leads the Recommender Systems specialty section of Frontiers in Big Data.
Education infrastructure is absent as well. Books on recommender systems, online courses and MOOCs, and recommender-systems summer schools organise and transmit knowledge, mentor new researchers, and bring people into the field. Recent examples include the RecSys Summer Schools in Copenhagen in 2023 and Bari in 2024 and the ACM Europe School on Recommender Systems in Vienna in 2025.
The same applies to journal editing, reviewing, Steering Committees, workshops outside the seven conference series, mentoring, doctoral supervision, datasets, and open-source software. Reviewers, Senior Program Committee members, meta-reviewers, session chairs, student volunteers, administrators, audiovisual and IT staff, venue staff, professional organisers, captioners, interpreters, childcare providers, and ACM staff all contribute to an ACM RecSys edition without necessarily appearing in these rankings.
The 289 people counted here are one visible layer of a much larger collective effort.
6. What I take away
Repeated service has different shapes. Chen and Loepp reach high ACM RecSys counts through very different kinds of recurrence. Boratto and Chen reach the same combined total at very different tempos. Hauptmann accumulated six ACM RecSys roles across three editions by handling Women’s Events and Publicity simultaneously; Konstan’s six ACM RecSys roles span twenty years.
Organisational activity also crosses conference boundaries. Some organisers first appear at ACM RecSys and later elsewhere; others first appear at a neighbouring conference and later at ACM RecSys. Santos spans five conference series, while Jannach has substantial records on both sides of the ACM RecSys/Other split.
Most importantly, chair counts remain a narrow measure of academic citizenship even after widening the time period and conference set.
Conference service has a peculiar property: when it works, much of it disappears.
The website loads. The programme exists. The proceedings arrive. Workshops happen. The microphones work. Students find their way into the community. Registration works. Reviewers receive their assignments.
That is why “thank you for your service” still seems appropriate to me. Conference service is one form of academic citizenship within a much larger collective effort. Most of that work produces no citation. Yet without it, there would be rather fewer papers to cite.
7. How I created the dataset
ACM RecSys defines the population. I reconstructed the available ACM RecSys organising committees from conference websites and committee pages. A person enters the dataset after holding, or being announced to hold, at least one recorded ACM RecSys chair position; for those 289 people I then collected chair positions at ACM SIGIR, ACM UMAP, The ACM Web Conference, ACM WSDM, ACM CIKM, and ECIR.
The Other tables are therefore not complete rankings of those six conferences. They contain only researchers who are also part of the ACM RecSys chair-defined population. Roles outside the seven series may appear as context but never enter the rankings.
The first-service-side field compares the first recorded ACM RecSys year with the first recorded year at the six neighbouring series. It is labelled “ACM RecSys” when ACM RecSys comes first, “Other Conference” when a neighbouring series comes first, and “ACM RecSys & Other Conference” when both first occur in the same year.
Every recorded chair position counts once; I do not weight roles by workload, seniority, or prestige. The tables use thresholds rather than fixed Top-N cuts so that ties at the boundary are not split arbitrarily. Announced future positions are included as set out in the scope note near the top.
For the service-density comparison, I divide the seven-conference role count by the inclusive span from the first to the last recorded role. This is a descriptive density over the recorded span, not a measure of workload or annual effort.
The reconstruction is best effort. Older sites disappear, some pages are incomplete, and titles change over time. When I find additional qualifying roles, I add them and recompute the counts. Corrections are welcome.
Claude and ChatGPT assisted with large parts of the data checking and editing. I reviewed the resulting data and remain responsible for the counts, interpretations, and any remaining errors.
8. Additional rankings
The main text uses only the tables that carry a particular argument. For transparency, the remaining ranking views are collected below.
Show additional ranking tables
ACM RecSys chair roles since 2020
| Rank | Person | Since 2020 | ACM RecSys total |
|---|---|---|---|
| 1 | Ludovico Boratto | 7 | 7 |
| 1 | Saikishore Kalloori | 7 | 7 |
| 3 | Hanna Hauptmann | 6 | 6 |
| 3 | Sole Pera | 6 | 8 |
| 5 | Noemi Mauro | 5 | 5 |
| 5 | Özlem Özgöbek | 5 | 5 |
| 7 | Abhishek Srivastava | 4 | 4 |
| 7 | Alain Starke | 4 | 4 |
| 7 | Arnab (Arnie) Bhadury | 4 | 4 |
| 7 | Cataldo Musto | 4 | 5 |
| 7 | Fedelucio Narducci | 4 | 4 |
| 7 | Julia Neidhardt | 4 | 4 |
| 7 | Li Chen | 4 | 11 |
| 7 | Linus Dietz | 4 | 4 |
| 7 | Martijn Willemsen | 4 | 5 |
| 7 | Michael Ekstrand | 4 | 7 |
| 7 | Noam Koenigstein | 4 | 4 |
| 7 | Olivier Jeunen | 4 | 4 |
| 7 | Tao Ye | 4 | 6 |
| 7 | Zhenhua Dong | 4 | 4 |
Other conference roles overall
| Rank | Person | Other roles | ACM RecSys roles | Total |
|---|---|---|---|---|
| 1 | Min Zhang | 13 | 1 | 14 |
| 2 | Hui Fang | 10 | 1 | 11 |
| 3 | Ludovico Boratto | 9 | 7 | 16 |
| 3 | Sole Pera | 9 | 8 | 17 |
| 3 | Vanessa Murdock | 9 | 2 | 11 |
| 6 | Yong Zheng | 8 | 2 | 10 |
| 7 | Alejandro Bellogín | 7 | 4 | 11 |
| 7 | Bamshad Mobasher | 7 | 4 | 11 |
| 7 | Dietmar Jannach | 7 | 6 | 13 |
| 7 | Maria Maistro | 7 | 2 | 9 |
| 7 | Marko Tkalčič | 7 | 3 | 10 |
| 7 | Noemi Mauro | 7 | 5 | 12 |
| 7 | Rodrygo Santos | 7 | 1 | 8 |
| 7 | Yi Zhang | 7 | 4 | 11 |
| 15 | Alan Said | 6 | 9 | 15 |
| 15 | Irwin King | 6 | 1 | 7 |
| 15 | Jie Tang | 6 | 1 | 7 |
| 15 | Nicola Ferro | 6 | 1 | 7 |
| 15 | Pasquale Lops | 6 | 2 | 8 |
| 15 | Tat-Seng Chua | 6 | 1 | 7 |
Other conference roles since 2020
| Rank | Person | Other since 2020 | ACM RecSys since 2020 | Total since 2020 |
|---|---|---|---|---|
| 1 | Ludovico Boratto | 9 | 7 | 16 |
| 1 | Sole Pera | 9 | 6 | 15 |
| 3 | Min Zhang | 8 | 1 | 9 |
| 4 | Alejandro Bellogín | 7 | 1 | 8 |
| 4 | Maria Maistro | 7 | 2 | 9 |
| 4 | Noemi Mauro | 7 | 5 | 12 |
| 7 | Yong Zheng | 6 | 1 | 7 |
| 8 | Dietmar Jannach | 5 | 1 | 6 |
| 8 | Helma Torkamaan | 5 | 1 | 6 |
| 8 | Mirko Marras | 5 | 1 | 6 |
| 8 | Nicola Ferro | 5 | 1 | 6 |
| 8 | Rodrygo Santos | 5 | 1 | 6 |
| 13 | Alan Said | 4 | 3 | 7 |
| 13 | Antonela Tommasel | 4 | 2 | 6 |
| 13 | Bart Knijnenburg | 4 | 2 | 6 |
| 13 | Cataldo Musto | 4 | 4 | 8 |
| 13 | Christine Bauer | 4 | 3 | 7 |
| 13 | Cristina Gena | 4 | 1 | 5 |
| 13 | Eva Zangerle | 4 | 1 | 5 |
| 13 | Julian McAuley | 4 | 1 | 5 |
| 13 | Marko Tkalčič | 4 | 1 | 5 |
| 13 | Tao Ye | 4 | 4 | 8 |
| 13 | Xiangnan He | 4 | 1 | 5 |
Combined roles overall
| Rank | Person | Total | ACM RecSys | Other |
|---|---|---|---|---|
| 1 | Sole Pera | 17 | 8 | 9 |
| 2 | Li Chen | 16 | 11 | 5 |
| 2 | Ludovico Boratto | 16 | 7 | 9 |
| 4 | Alan Said | 15 | 9 | 6 |
| 5 | Min Zhang | 14 | 1 | 13 |
| 6 | Dietmar Jannach | 13 | 6 | 7 |
| 7 | Bart Knijnenburg | 12 | 7 | 5 |
| 7 | Noemi Mauro | 12 | 5 | 7 |
| 9 | Alejandro Bellogín | 11 | 4 | 7 |
| 9 | Bamshad Mobasher | 11 | 4 | 7 |
| 9 | Hui Fang | 11 | 1 | 10 |
| 9 | Vanessa Murdock | 11 | 2 | 9 |
| 9 | Yi Zhang | 11 | 4 | 7 |
| 14 | Cataldo Musto | 10 | 5 | 5 |
| 14 | Marko Tkalčič | 10 | 3 | 7 |
| 14 | Michael Ekstrand | 10 | 7 | 3 |
| 14 | Tao Ye | 10 | 6 | 4 |
| 14 | Yong Zheng | 10 | 2 | 8 |
| 19 | Benedikt Loepp | 9 | 8 | 1 |
| 19 | Christoph Trattner | 9 | 5 | 4 |
| 19 | Maria Maistro | 9 | 2 | 7 |
| 22 | Francesco Ricci | 8 | 6 | 2 |
| 22 | Hanna Hauptmann | 8 | 6 | 2 |
| 22 | Pablo Castells | 8 | 5 | 3 |
| 22 | Pasquale Lops | 8 | 2 | 6 |
| 22 | Rodrygo Santos | 8 | 1 | 7 |
| 22 | Shlomo Berkovsky | 8 | 5 | 3 |
Combined roles since 2020
| Rank | Person | Total since 2020 | ACM RecSys since 2020 | Other since 2020 |
|---|---|---|---|---|
| 1 | Ludovico Boratto | 16 | 7 | 9 |
| 2 | Sole Pera | 15 | 6 | 9 |
| 3 | Noemi Mauro | 12 | 5 | 7 |
| 4 | Maria Maistro | 9 | 2 | 7 |
| 4 | Min Zhang | 9 | 1 | 8 |
| 6 | Alejandro Bellogín | 8 | 1 | 7 |
| 6 | Cataldo Musto | 8 | 4 | 4 |
| 6 | Hanna Hauptmann | 8 | 6 | 2 |
| 6 | Tao Ye | 8 | 4 | 4 |
| 10 | Alain Starke | 7 | 4 | 3 |
| 10 | Alan Said | 7 | 3 | 4 |
| 10 | Christine Bauer | 7 | 3 | 4 |
| 10 | Fedelucio Narducci | 7 | 4 | 3 |
| 10 | Michael Ekstrand | 7 | 4 | 3 |
| 10 | Saikishore Kalloori | 7 | 7 | 0 |
| 10 | Yong Zheng | 7 | 1 | 6 |
| 17 | Antonela Tommasel | 6 | 2 | 4 |
| 17 | Bart Knijnenburg | 6 | 2 | 4 |
| 17 | Dietmar Jannach | 6 | 1 | 5 |
| 17 | Erasmo Purificato | 6 | 3 | 3 |
| 17 | Helma Torkamaan | 6 | 1 | 5 |
| 17 | Julia Neidhardt | 6 | 4 | 2 |
| 17 | Li Chen | 6 | 4 | 2 |
| 17 | Martijn Willemsen | 6 | 4 | 2 |
| 17 | Mirko Marras | 6 | 1 | 5 |
| 17 | Nicola Ferro | 6 | 1 | 5 |
| 17 | Pablo Castells | 6 | 3 | 3 |
| 17 | Rodrygo Santos | 6 | 1 | 5 |
| 17 | Vito Walter Anelli | 6 | 3 | 3 |
9. Complete dataset
The expandable master table below reproduces the full 289-person dataset used for this analysis: role histories, the first recorded side of service, first and last recorded years, service spans, rankings, and the six summary counts. The values below are regenerated from the current workbook.
Show the complete master table of 289 people (22 columns)
| Person | Roles | Was the First Year of Chairing at ACM RecSys or at Some Other (RecSys-Related) Conference | ACM RecSys | Other RecSys-Related Conferences | All Conferences | Rank (All RecSys-Related Conferences) | Rank (All RecSys-Related Conferences Since 2020) | Rank (ACM RecSys Only) | Rank (ACM RecSys Only; Since 2020) | Total | Total since 2020 | ACM RecSys Conference Only | Other RecSys-Related Conferences (UMAP, SIGIR, …) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| First Year of Service | Last Year of Service | Service Span (inclusive) | First Year of Service | Last Year of Service | Service Span (inclusive) | First Year of Service | Last Year of Service | Service Span (inclusive) | Total Role Count | Since 2020 | Total Role Count | Since 2020 | |||||||||
| Sole Pera | General Chair (RecSys 2018); Program Chair (RecSys 2025; UMAP 2023; CIKM 2024); Track Chair (UMAP 2021); Workshop Chair (CIKM 2026); Tutorial Chair (CIKM 2023); Workshop/Tutorial Chair (UMAP 2026); Doctoral Chair (RecSys 2022; SIGIR 2022, 2023); Demo/LBR Chair (RecSys 2019); Inclusion & Accessibility Chair (RecSys 2020, 2021; UMAP 2022); Women’s Events Chair (RecSys 2024, 2026) | ACM RecSys | 2018 | 2026 | 9 | 2021 | 2026 | 6 | 2018 | 2026 | 9 | 1 | 2 | 3 | 3 | 17 | 15 | 8 | 6 | 9 | 9 |
| Li Chen | General Chair (RecSys 2023); Program Chair (RecSys 2020; UMAP 2018); Track Chair (UMAP 2019, 2023); Workshop Chair (RecSys 2026); Tutorial Chair (RecSys 2016, 2017); Demo/LBR Chair (RecSys 2014; UMAP 2012, 2020); Women’s Events Chair (RecSys 2025); Local Chair (RecSys 2013); Liaison Chair (RecSys 2010, 2011, 2012) | ACM RecSys | 2010 | 2026 | 17 | 2012 | 2023 | 12 | 2010 | 2026 | 17 | 2 | 17 | 1 | 7 | 16 | 6 | 11 | 4 | 5 | 2 |
| Ludovico Boratto | General Chair (UMAP 2022, 2024); Track Chair (UMAP 2021; ECIR 2024, 2025); Workshop Chair (RecSys 2023, 2025); Doctoral Chair (RecSys 2024); Demo/LBR Chair (RecSys 2020, 2021, 2022; UMAP 2023; SIGIR 2026); Reproducibility Chair (RecSys 2026); Sponsorship Chair (UMAP 2026); Web/Media Chair (SIGIR 2025) | ACM RecSys | 2020 | 2026 | 7 | 2021 | 2026 | 6 | 2020 | 2026 | 7 | 2 | 1 | 5 | 1 | 16 | 16 | 7 | 7 | 9 | 9 |
| Alan Said | General Chair (RecSys 2019; UMAP 2026); Track Chair (UMAP 2019, 2023, 2024; WebConf 2026); Industry Chair (RecSys 2017); Workshop Chair (RecSys 2015; UMAP 2015); Tutorial Chair (RecSys 2023); Reproducibility Chair (RecSys 2020, 2021); Publicity Chair (RecSys 2012, 2014, 2016) | ACM RecSys | 2012 | 2023 | 12 | 2015 | 2026 | 12 | 2012 | 2026 | 15 | 4 | 10 | 2 | 21 | 15 | 7 | 9 | 3 | 6 | 4 |
| Min Zhang | Program Chair (RecSys 2023; SIGIR 2026; CIKM 2023; WSDM 2017); Track Chair (SIGIR 2024); Workshop Chair (WSDM 2019); Tutorial Chair (SIGIR 2019; CIKM 2021; WSDM 2015, 2021); Short Paper Chair (SIGIR 2018); Best Paper Chair (SIGIR 2022; WSDM 2020); Publicity Chair (WSDM 2023) | Other Conference | 2023 | 2023 | 1 | 2015 | 2026 | 12 | 2015 | 2026 | 12 | 5 | 4 | 110 | 68 | 14 | 9 | 1 | 1 | 13 | 8 |
| Dietmar Jannach | Program Chair (RecSys 2011; UMAP 2019); Track Chair (UMAP 2018, 2022, 2023, 2024); Workshop Chair (RecSys 2010, 2016); Tutorial Chair (RecSys 2013); Workshop/Tutorial Chair (UMAP 2021); Doctoral Chair (RecSys 2015); Short Paper Chair (ECIR 2025); Reproducibility Chair (RecSys 2023) | ACM RecSys | 2010 | 2023 | 14 | 2018 | 2025 | 8 | 2010 | 2025 | 16 | 6 | 17 | 9 | 68 | 13 | 6 | 6 | 1 | 7 | 5 |
| Bart Knijnenburg | Program Chair (UMAP 2022); Track Chair (UMAP 2019, 2023); Industry Chair (RecSys 2019); Workshop Chair (RecSys 2026); Tutorial Chair (RecSys 2018, 2025); Doctoral Chair (RecSys 2017); Demo/LBR Chair (UMAP 2020, 2021); Proceedings Chair (RecSys 2014); Student Chair (RecSys 2016) | ACM RecSys | 2014 | 2026 | 13 | 2019 | 2023 | 5 | 2014 | 2026 | 13 | 7 | 17 | 5 | 40 | 12 | 6 | 7 | 2 | 5 | 4 |
| Noemi Mauro | Track Chair (UMAP 2023); Tutorial Chair (RecSys 2022); Workshop/Tutorial Chair (UMAP 2024); Doctoral Chair (UMAP 2021); Demo/LBR Chair (UMAP 2025); Proceedings Chair (RecSys 2021; UMAP 2022, 2023); Publicity Chair (RecSys 2026); Student Chair (RecSys 2024, 2025; UMAP 2026) | ACM RecSys & Other Conference | 2021 | 2026 | 6 | 2021 | 2026 | 6 | 2021 | 2026 | 6 | 7 | 3 | 17 | 5 | 12 | 12 | 5 | 5 | 7 | 7 |
| Alejandro Bellogín | General Chair (UMAP 2022); Program Chair (UMAP 2026); Track Chair (UMAP 2021, 2024); Workshop Chair (RecSys 2018, 2024); Tutorial Chair (RecSys 2019); Doctoral Chair (UMAP 2025); Proceedings Chair (RecSys 2016; SIGIR 2021); Inclusion & Accessibility Chair (SIGIR 2022) | ACM RecSys | 2016 | 2024 | 9 | 2021 | 2026 | 6 | 2016 | 2026 | 11 | 9 | 6 | 26 | 68 | 11 | 8 | 4 | 1 | 7 | 7 |
| Bamshad Mobasher | General Chair (RecSys 2011, 2027); Program Chair (RecSys 2008; UMAP 2012); Track Chair (UMAP 2014, 2017, 2019, 2022); Doctoral Chair (RecSys 2018); Demo/LBR Chair (UMAP 2024, 2025) | ACM RecSys | 2008 | 2027 | 20 | 2012 | 2025 | 14 | 2008 | 2027 | 20 | 9 | 45 | 26 | 68 | 11 | 4 | 4 | 1 | 7 | 3 |
| Yi Zhang | General Chair (SIGIR 2027); Program Chair (SIGIR 2024); Track Chair (UMAP 2023; SIGIR 2018; CIKM 2008); Tutorial Chair (RecSys 2023; SIGIR 2011); Doctoral Chair (RecSys 2013, 2014, 2022); Sponsorship Chair (CIKM 2016) | Other Conference | 2013 | 2023 | 11 | 2008 | 2027 | 20 | 2008 | 2027 | 20 | 9 | 30 | 26 | 40 | 11 | 5 | 4 | 2 | 7 | 3 |
| Vanessa Murdock | General Chair (RecSys 2022); Program Chair (SIGIR 2020; CIKM 2026); Track Chair (CIKM 2015); Industry Chair (SIGIR 2017; ECIR 2020); Workshop Chair (SIGIR 2012); Tutorial Chair (WSDM 2017); Demo/LBR Chair (RecSys 2018; SIGIR 2014; ECIR 2011) | Other Conference | 2018 | 2022 | 5 | 2011 | 2026 | 16 | 2011 | 2026 | 16 | 9 | 45 | 69 | 68 | 11 | 4 | 2 | 1 | 9 | 3 |
| Hui Fang | Track Chair (UMAP 2024; CIKM 2009); Workshop Chair (SIGIR 2018); Tutorial Chair (CIKM 2016); Doctoral Chair (SIGIR 2024; WSDM 2018); Demo/LBR Chair (UMAP 2018); Short Paper Chair (SIGIR 2017, 2021); Proceedings Chair (CIKM 2014); Reproducibility Chair (RecSys 2023) | Other Conference | 2023 | 2023 | 1 | 2009 | 2024 | 16 | 2009 | 2024 | 16 | 9 | 45 | 110 | 68 | 11 | 4 | 1 | 1 | 10 | 3 |
| Michael Ekstrand | General Chair (RecSys 2018); Program Chair (RecSys 2022); Track Chair (UMAP 2021, 2023; WebConf 2026); Doctoral Chair (RecSys 2020, 2025); Demo/LBR Chair (RecSys 2012); Reproducibility Chair (RecSys 2026); Publicity Chair (RecSys 2016) | ACM RecSys | 2012 | 2026 | 15 | 2021 | 2026 | 6 | 2012 | 2026 | 15 | 14 | 10 | 5 | 7 | 10 | 7 | 7 | 4 | 3 | 3 |
| Tao Ye | Industry Chair (RecSys 2018; UMAP 2025; SIGIR 2022, 2024; CIKM 2022); Inclusion & Accessibility Chair (RecSys 2024, 2025); Women’s Events Chair (RecSys 2026); Sponsorship Chair (RecSys 2019, 2020) | ACM RecSys | 2018 | 2026 | 9 | 2022 | 2025 | 4 | 2018 | 2026 | 9 | 14 | 6 | 9 | 7 | 10 | 8 | 6 | 4 | 4 | 4 |
| Cataldo Musto | Program Chair (UMAP 2025); Track Chair (UMAP 2023, 2024); Workshop Chair (RecSys 2024); Doctoral Chair (RecSys 2023); Demo/LBR Chair (UMAP 2022); Reproducibility Chair (RecSys 2025); Publicity Chair (UMAP 2017); Student Chair (RecSys 2019); Social Chair (RecSys 2020) | Other Conference | 2019 | 2025 | 7 | 2017 | 2025 | 9 | 2017 | 2025 | 9 | 14 | 6 | 17 | 7 | 10 | 8 | 5 | 4 | 5 | 4 |
| Marko Tkalčič | Program Chair (UMAP 2021); Track Chair (UMAP 2019, 2022, 2023); Workshop Chair (RecSys 2017); Workshop/Tutorial Chair (UMAP 2018); Doctoral Chair (UMAP 2026); Demo/LBR Chair (RecSys 2019, 2025; UMAP 2017) | ACM RecSys & Other Conference | 2017 | 2025 | 9 | 2017 | 2026 | 10 | 2017 | 2026 | 10 | 14 | 30 | 46 | 68 | 10 | 5 | 3 | 1 | 7 | 4 |
| Yong Zheng | Publicity Chair (RecSys 2018, 2023); Sponsorship Chair (UMAP 2023); Student Chair (UMAP 2018, 2019, 2020, 2021, 2022, 2024, 2025) | ACM RecSys & Other Conference | 2018 | 2023 | 6 | 2018 | 2025 | 8 | 2018 | 2025 | 8 | 14 | 10 | 69 | 68 | 10 | 7 | 2 | 1 | 8 | 6 |
| Benedikt Loepp | Proceedings Chair (RecSys 2022); Publicity Chair (UMAP 2021); Student Chair (RecSys 2021); Web/Media Chair (RecSys 2015, 2016, 2017, 2018, 2019, 2020) | ACM RecSys | 2015 | 2022 | 8 | 2021 | 2021 | 1 | 2015 | 2022 | 8 | 19 | 45 | 3 | 21 | 9 | 4 | 8 | 3 | 1 | 1 |
| Christoph Trattner | Track Chair (UMAP 2019); Workshop Chair (RecSys 2019); Tutorial Chair (RecSys 2020, 2024); Demo/LBR Chair (RecSys 2018); Publicity Chair (RecSys 2017; UMAP 2016); Liaison Chair (UMAP 2014, 2015) | Other Conference | 2017 | 2024 | 8 | 2014 | 2019 | 6 | 2014 | 2024 | 11 | 19 | 83 | 17 | 40 | 9 | 2 | 5 | 2 | 4 | 0 |
| Maria Maistro | General Chair (SIGIR 2025); Workshop Chair (ECIR 2024); Tutorial Chair (SIGIR 2022); Short Paper Chair (SIGIR 2026; ECIR 2023); Reproducibility Chair (RecSys 2024; ECIR 2021); Inclusion & Accessibility Chair (RecSys 2025); Integration Chair (ECIR 2025) | Other Conference | 2024 | 2025 | 2 | 2021 | 2026 | 6 | 2021 | 2026 | 6 | 19 | 4 | 69 | 40 | 9 | 9 | 2 | 2 | 7 | 7 |
| Francesco Ricci | General Chair (RecSys 2017); Program Chair (RecSys 2008; UMAP 2015); Tutorial Chair (RecSys 2010, 2015, 2016); Doctoral Chair (RecSys 2007; UMAP 2014) | ACM RecSys | 2007 | 2017 | 11 | 2014 | 2015 | 2 | 2007 | 2017 | 11 | 22 | 197 | 9 | 187 | 8 | 0 | 6 | 0 | 2 | 0 |
| Hanna Hauptmann | Demo/LBR Chair (UMAP 2024); Inclusion & Accessibility Chair (UMAP 2023); Women’s Events Chair (RecSys 2021, 2022, 2023); Publicity Chair (RecSys 2021, 2022, 2023) | ACM RecSys | 2021 | 2023 | 3 | 2023 | 2024 | 2 | 2021 | 2024 | 4 | 22 | 6 | 9 | 3 | 8 | 8 | 6 | 6 | 2 | 2 |
| Pablo Castells | General Chair (SIGIR 2022; ECIR 2020); Program Chair (RecSys 2016; SIGIR 2021); Industry Chair (RecSys 2024); Workshop Chair (RecSys 2020); Doctoral Chair (RecSys 2021); Demo/LBR Chair (RecSys 2015) | ACM RecSys | 2015 | 2024 | 10 | 2020 | 2022 | 3 | 2015 | 2024 | 10 | 22 | 17 | 17 | 21 | 8 | 6 | 5 | 3 | 3 | 3 |
| Shlomo Berkovsky | General Chair (RecSys 2023); Program Chair (RecSys 2017); Track Chair (UMAP 2018); Workshop Chair (RecSys 2013); Tutorial Chair (RecSys 2011); Workshop/Tutorial Chair (UMAP 2013); Doctoral Chair (RecSys 2014); Demo/LBR Chair (WebConf 2025) | ACM RecSys | 2011 | 2023 | 13 | 2013 | 2025 | 13 | 2011 | 2025 | 15 | 22 | 83 | 17 | 68 | 8 | 2 | 5 | 1 | 3 | 1 |
| Pasquale Lops | General Chair (RecSys 2024); Track Chair (UMAP 2016, 2024); Workshop/Tutorial Chair (UMAP 2013, 2020); Demo/LBR Chair (UMAP 2018); Proceedings Chair (SIGIR 2025); Publicity Chair (RecSys 2015) | Other Conference | 2015 | 2024 | 10 | 2013 | 2025 | 13 | 2013 | 2025 | 13 | 22 | 45 | 69 | 68 | 8 | 4 | 2 | 1 | 6 | 3 |
| Rodrygo Santos | General Chair (RecSys 2020); Program Chair (CIKM 2023); Tutorial Chair (SIGIR 2021, 2025); Doctoral Chair (UMAP 2024); Short Paper Chair (WSDM 2026); Sponsorship Chair (WSDM 2016); Web/Media Chair (CIKM 2011) | Other Conference | 2020 | 2020 | 1 | 2011 | 2026 | 16 | 2011 | 2026 | 16 | 22 | 17 | 110 | 68 | 8 | 6 | 1 | 1 | 7 | 5 |
| Saikishore Kalloori | Challenge/Cup Chair (RecSys 2021, 2022); Student Chair (RecSys 2020); Finance/Registration Chair (RecSys 2023, 2024, 2025, 2026) | ACM RecSys | 2020 | 2026 | 7 | 2020 | 2026 | 7 | 28 | 10 | 5 | 1 | 7 | 7 | 7 | 7 | 0 | 0 | |||
| Alexander Tuzhilin | General Chair (RecSys 2009); Program Chair (RecSys 2017); Track Chair (CIKM 2008); Tutorial Chair (RecSys 2012, 2015); Doctoral Chair (RecSys 2011, 2026) | Other Conference | 2009 | 2026 | 18 | 2008 | 2008 | 1 | 2008 | 2026 | 19 | 28 | 111 | 9 | 68 | 7 | 1 | 6 | 1 | 1 | 0 |
| Joseph A. Konstan | General Chair (RecSys 2007, 2026); Program Chair (RecSys 2021; UMAP 2011); Workshop Chair (RecSys 2009); Doctoral Chair (RecSys 2008, 2016) | ACM RecSys | 2007 | 2026 | 20 | 2011 | 2011 | 1 | 2007 | 2026 | 20 | 28 | 83 | 9 | 40 | 7 | 2 | 6 | 2 | 1 | 0 |
| Pearl Pu | General Chair (RecSys 2008); Program Chair (RecSys 2013); Workshop Chair (RecSys 2012); Doctoral Chair (RecSys 2010; UMAP 2018); Demo/LBR Chair (RecSys 2017); Short Paper Chair (RecSys 2007) | ACM RecSys | 2007 | 2017 | 11 | 2018 | 2018 | 1 | 2007 | 2018 | 12 | 28 | 197 | 9 | 187 | 7 | 0 | 6 | 0 | 1 | 0 |
| Martijn Willemsen | General Chair (RecSys 2021); Program Chair (RecSys 2026); Workshop Chair (RecSys 2025); Tutorial Chair (RecSys 2024); Doctoral Chair (RecSys 2016; UMAP 2023, 2024) | ACM RecSys | 2016 | 2026 | 11 | 2023 | 2024 | 2 | 2016 | 2026 | 11 | 28 | 17 | 17 | 7 | 7 | 6 | 5 | 4 | 2 | 2 |
| Paolo Cremonesi | General Chair (RecSys 2017); Track Chair (CIKM 2020); Workshop Chair (RecSys 2013); Reproducibility Chair (RecSys 2020, 2021, 2022); Best Paper Chair – Resource Papers (CIKM 2021) | ACM RecSys | 2013 | 2022 | 10 | 2020 | 2021 | 2 | 2013 | 2022 | 10 | 28 | 30 | 17 | 21 | 7 | 5 | 5 | 3 | 2 | 2 |
| Alain Starke | Track Chair (UMAP 2024); Demo/LBR Chair (UMAP 2026); Publicity Chair (RecSys 2021, 2022, 2024, 2025; UMAP 2025) | ACM RecSys | 2021 | 2025 | 5 | 2024 | 2026 | 3 | 2021 | 2026 | 6 | 28 | 10 | 26 | 7 | 7 | 7 | 4 | 4 | 3 | 3 |
| Fedelucio Narducci | General Chair (UMAP 2025); Track Chair (UMAP 2024); Tutorial Chair (RecSys 2022, 2025); Proceedings Chair (SIGIR 2025); Sponsorship Chair (RecSys 2024); Student Chair (RecSys 2023) | ACM RecSys | 2022 | 2025 | 4 | 2024 | 2025 | 2 | 2022 | 2025 | 4 | 28 | 10 | 26 | 7 | 7 | 7 | 4 | 4 | 3 | 3 |
| Robin Burke | General Chair (RecSys 2011); Program Chair (RecSys 2009; UMAP 2020); Tutorial Chair (UMAP 2014); Doctoral Chair (RecSys 2017; UMAP 2015); Reproducibility Chair (RecSys 2024) | ACM RecSys | 2009 | 2024 | 16 | 2014 | 2020 | 7 | 2009 | 2024 | 16 | 28 | 83 | 26 | 68 | 7 | 2 | 4 | 1 | 3 | 1 |
| Shaghayegh (Sherry) Sahebi | Track Chair (UMAP 2024); Doctoral Chair (RecSys 2025); Demo/LBR Chair (UMAP 2023, 2026); Proceedings Chair (RecSys 2020); Publicity Chair (RecSys 2019); Student Chair (RecSys 2018) | ACM RecSys | 2018 | 2025 | 8 | 2023 | 2026 | 4 | 2018 | 2026 | 9 | 28 | 30 | 26 | 40 | 7 | 5 | 4 | 2 | 3 | 3 |
| Christine Bauer | General Chair (RecSys 2027); Track Chair (UMAP 2021); Tutorial Chair (ECIR 2025); Doctoral Chair (RecSys 2021, 2023; CIKM 2023); Short Paper Chair (ECIR 2026) | ACM RecSys & Other Conference | 2021 | 2027 | 7 | 2021 | 2026 | 6 | 2021 | 2027 | 7 | 28 | 10 | 46 | 21 | 7 | 7 | 3 | 3 | 4 | 4 |
| Helma Torkamaan | Inclusion & Accessibility Chair (RecSys 2026; UMAP 2024, 2025, 2026); Publicity Chair (UMAP 2023); Publicity/Web Chair (UMAP 2022); Student Chair (RecSys 2019) | ACM RecSys | 2019 | 2026 | 8 | 2022 | 2026 | 5 | 2019 | 2026 | 8 | 28 | 17 | 69 | 68 | 7 | 6 | 2 | 1 | 5 | 5 |
| Irwin King | General Chair (RecSys 2013; WSDM 2011; WebConf 2020); Workshop Chair (WebConf 2008); Tutorial Chair (WebConf 2012); Demo/LBR Chair (WebConf 2013); Advisor (WSDM 2015) | Other Conference | 2013 | 2013 | 1 | 2008 | 2020 | 13 | 2008 | 2020 | 13 | 28 | 111 | 110 | 187 | 7 | 1 | 1 | 0 | 6 | 1 |
| Jie Tang | General Chair (WebConf 2023); Program Chair (WSDM 2015; WebConf 2021); Track Chair (CIKM 2016; WebConf 2022); Workshop Chair (RecSys 2013); Sponsorship Chair (WebConf 2019) | ACM RecSys | 2013 | 2013 | 1 | 2015 | 2023 | 9 | 2013 | 2023 | 11 | 28 | 60 | 110 | 187 | 7 | 3 | 1 | 0 | 6 | 3 |
| Nicola Ferro | General Chair (SIGIR 2025; CIKM 2026; ECIR 2016); Track Chair (CIKM 2021); Short Paper Chair (ECIR 2020); Reproducibility Chair (RecSys 2024); Sponsorship Chair (ECIR 2021) | Other Conference | 2024 | 2024 | 1 | 2016 | 2026 | 11 | 2016 | 2026 | 11 | 28 | 17 | 110 | 68 | 7 | 6 | 1 | 1 | 6 | 5 |
| Tat-Seng Chua | General Chair (SIGIR 2008; WSDM 2023); Program Chair (SIGIR 2011); Track Chair (SIGIR 2018, 2023); Workshop Chair (SIGIR 2019); Tutorial Chair (RecSys 2021) | Other Conference | 2021 | 2021 | 1 | 2008 | 2023 | 16 | 2008 | 2023 | 16 | 28 | 60 | 110 | 68 | 7 | 3 | 1 | 1 | 6 | 2 |
| Humberto Corona | General Chair (RecSys 2021); Inclusion & Accessibility Chair (RecSys 2018, 2019, 2020); Publicity Chair (RecSys 2018); Sponsorship Chair (RecSys 2022) | ACM RecSys | 2018 | 2022 | 5 | 2018 | 2022 | 5 | 44 | 60 | 9 | 21 | 6 | 3 | 6 | 3 | 0 | 0 | |||
| Alexander Felfernig | Program Chair (RecSys 2009); Track Chair (UMAP 2016); Tutorial Chair (RecSys 2014); Doctoral Chair (RecSys 2008, 2012); Liaison Chair (RecSys 2007) | ACM RecSys | 2007 | 2014 | 8 | 2016 | 2016 | 1 | 2007 | 2016 | 10 | 44 | 197 | 17 | 187 | 6 | 0 | 5 | 0 | 1 | 0 |
| Ido Guy | Program Chair (RecSys 2012); Industry Chair (RecSys 2010; UMAP 2012; WSDM 2021); Tutorial Chair (RecSys 2011); Demo/LBR Chair (RecSys 2016) | ACM RecSys | 2010 | 2016 | 7 | 2012 | 2021 | 10 | 2010 | 2021 | 12 | 44 | 111 | 26 | 187 | 6 | 1 | 4 | 0 | 2 | 1 |
| Julia Neidhardt | Program Chair (UMAP 2023); Demo/LBR Chair (RecSys 2025); Inclusion & Accessibility Chair (UMAP 2022); Women’s Events Chair (RecSys 2021, 2022, 2023) | ACM RecSys | 2021 | 2025 | 5 | 2022 | 2023 | 2 | 2021 | 2025 | 5 | 44 | 17 | 26 | 7 | 6 | 6 | 4 | 4 | 2 | 2 |
| Erasmo Purificato | Industry Chair (UMAP 2026); Proceedings Chair (UMAP 2024, 2025); Student Chair (RecSys 2026); Web/Media Chair (RecSys 2024, 2025) | ACM RecSys & Other Conference | 2024 | 2026 | 3 | 2024 | 2026 | 3 | 2024 | 2026 | 3 | 44 | 17 | 46 | 21 | 6 | 6 | 3 | 3 | 3 | 3 |
| Markus Zanker | General Chair (RecSys 2015); Program Chair (RecSys 2010); Track Chair (UMAP 2018, 2022); Doctoral Chair (RecSys 2026; UMAP 2019) | ACM RecSys | 2010 | 2026 | 17 | 2018 | 2022 | 5 | 2010 | 2026 | 17 | 44 | 83 | 46 | 68 | 6 | 2 | 3 | 1 | 3 | 1 |
| Vito Walter Anelli | Track Chair (UMAP 2024); Reproducibility Chair (RecSys 2024; ECIR 2025); Challenge/Cup Chair (RecSys 2020, 2021); Web/Media Chair (UMAP 2022) | ACM RecSys | 2020 | 2024 | 5 | 2022 | 2025 | 4 | 2020 | 2025 | 6 | 44 | 17 | 46 | 21 | 6 | 6 | 3 | 3 | 3 | 3 |
| Antonela Tommasel | Workshop/Tutorial Chair (UMAP 2023); Doctoral Chair (WSDM 2026); Inclusion & Accessibility Chair (RecSys 2022); Publicity Chair (CIKM 2024); Student Chair (RecSys 2025; UMAP 2024) | ACM RecSys | 2022 | 2025 | 4 | 2023 | 2026 | 4 | 2022 | 2026 | 5 | 44 | 17 | 69 | 40 | 6 | 6 | 2 | 2 | 4 | 4 |
| Federica Cena | Program Chair (UMAP 2017); Track Chair (UMAP 2023, 2024); Tutorial Chair (RecSys 2024); Workshop/Tutorial Chair (UMAP 2016); Inclusion & Accessibility Chair (RecSys 2025) | Other Conference | 2024 | 2025 | 2 | 2016 | 2024 | 9 | 2016 | 2025 | 10 | 44 | 45 | 69 | 40 | 6 | 4 | 2 | 2 | 4 | 2 |
| Alejandro Jaimes | Track Chair (WebConf 2013, 2014, 2024); Industry Chair (RecSys 2010; UMAP 2009, 2013) | Other Conference | 2010 | 2010 | 1 | 2009 | 2024 | 16 | 2009 | 2024 | 16 | 44 | 111 | 110 | 187 | 6 | 1 | 1 | 0 | 5 | 1 |
| Cristina Gena | General Chair (UMAP 2024); Program Chair (UMAP 2020); Track Chair (UMAP 2022); Tutorial Chair (RecSys 2022; UMAP 2015); Doctoral Chair (UMAP 2025) | Other Conference | 2022 | 2022 | 1 | 2015 | 2025 | 11 | 2015 | 2025 | 11 | 44 | 30 | 110 | 68 | 6 | 5 | 1 | 1 | 5 | 4 |
| Julian McAuley | Program Chair (RecSys 2021); Track Chair (CIKM 2025; WebConf 2022); Workshop Chair (WebConf 2021); Demo/LBR Chair (WSDM 2020); Proceedings Chair (WebConf 2019) | Other Conference | 2021 | 2021 | 1 | 2019 | 2025 | 7 | 2019 | 2025 | 7 | 44 | 30 | 110 | 68 | 6 | 5 | 1 | 1 | 5 | 4 |
| Maria Bielikova | General Chair (RecSys 2025; UMAP 2017); Track Chair (UMAP 2021, 2024); Doctoral Chair (UMAP 2016); Demo/LBR Chair (UMAP 2019) | Other Conference | 2025 | 2025 | 1 | 2016 | 2024 | 9 | 2016 | 2025 | 10 | 44 | 60 | 110 | 68 | 6 | 3 | 1 | 1 | 5 | 2 |
| Mirko Marras | General Chair (UMAP 2024); Track Chair (ECIR 2024, 2025); Workshop/Tutorial Chair (UMAP 2022); Proceedings Chair (UMAP 2023); Student Chair (RecSys 2024) | Other Conference | 2024 | 2024 | 1 | 2022 | 2025 | 4 | 2022 | 2025 | 4 | 44 | 17 | 110 | 68 | 6 | 6 | 1 | 1 | 5 | 5 |
| Peter Brusilovsky | Program Chair (RecSys 2019); Track Chair (UMAP 2017, 2018, 2022); Industry Chair (UMAP 2009); Doctoral Chair (UMAP 2011) | Other Conference | 2019 | 2019 | 1 | 2009 | 2022 | 14 | 2009 | 2022 | 14 | 44 | 111 | 110 | 187 | 6 | 1 | 1 | 0 | 5 | 1 |
| Tsvi Kuflik | General Chair (UMAP 2020, 2023); Program Chair (UMAP 2014); Workshop Chair (RecSys 2015); Workshop/Tutorial Chair (UMAP 2011); Doctoral Chair (UMAP 2025) | Other Conference | 2015 | 2015 | 1 | 2011 | 2025 | 15 | 2011 | 2025 | 15 | 44 | 60 | 110 | 187 | 6 | 3 | 1 | 0 | 5 | 3 |
| Özlem Özgöbek | Doctoral Chair (RecSys 2025); Women’s Events Chair (RecSys 2021, 2022, 2023, 2024) | ACM RecSys | 2021 | 2025 | 5 | 2021 | 2025 | 5 | 60 | 30 | 17 | 5 | 5 | 5 | 5 | 5 | 0 | 0 | |||
| Alexandros Karatzoglou | Industry Chair (RecSys 2018); Workshop Chair (RecSys 2010); Demo/LBR Chair (RecSys 2021); Challenge/Cup Chair (CIKM 2023); Publicity Chair (RecSys 2015) | ACM RecSys | 2010 | 2021 | 12 | 2023 | 2023 | 1 | 2010 | 2023 | 14 | 60 | 83 | 26 | 68 | 5 | 2 | 4 | 1 | 1 | 1 |
| Arnab (Arnie) Bhadury | Industry Chair (RecSys 2026); Sponsorship Chair (RecSys 2023, 2024, 2025; UMAP 2026) | ACM RecSys | 2023 | 2026 | 4 | 2026 | 2026 | 1 | 2023 | 2026 | 4 | 60 | 30 | 26 | 7 | 5 | 5 | 4 | 4 | 1 | 1 |
| Kim Falk | Industry Chair (RecSys 2019, 2020; UMAP 2026); Tutorial Chair (RecSys 2026); Sponsorship Chair (RecSys 2025) | ACM RecSys | 2019 | 2026 | 8 | 2026 | 2026 | 1 | 2019 | 2026 | 8 | 60 | 45 | 26 | 21 | 5 | 4 | 4 | 3 | 1 | 1 |
| Noam Koenigstein | Industry Chair (RecSys 2020); Demo/LBR Chair (WSDM 2021); Sponsorship Chair (RecSys 2024, 2025, 2026) | ACM RecSys | 2020 | 2026 | 7 | 2021 | 2021 | 1 | 2020 | 2026 | 7 | 60 | 30 | 26 | 7 | 5 | 5 | 4 | 4 | 1 | 1 |
| Olivier Jeunen | Industry Chair (RecSys 2025; ECIR 2024); Publicity Chair (RecSys 2024); Web/Media Chair (RecSys 2022, 2023) | ACM RecSys | 2022 | 2025 | 4 | 2024 | 2024 | 1 | 2022 | 2025 | 4 | 60 | 30 | 26 | 7 | 5 | 5 | 4 | 4 | 1 | 1 |
| Werner Geyer | General Chair (RecSys 2016); Track Chair (UMAP 2014); Industry Chair (RecSys 2015); Workshop Chair (RecSys 2011); Tutorial Chair (RecSys 2012) | ACM RecSys | 2011 | 2016 | 6 | 2014 | 2014 | 1 | 2011 | 2016 | 6 | 60 | 197 | 26 | 187 | 5 | 0 | 4 | 0 | 1 | 0 |
| Claudio Pomo | Workshop/Tutorial Chair (UMAP 2025); Challenge/Cup Chair (RecSys 2024, 2025, 2026); Inclusion & Accessibility Chair (UMAP 2024) | ACM RecSys & Other Conference | 2024 | 2026 | 3 | 2024 | 2025 | 2 | 2024 | 2026 | 3 | 60 | 30 | 46 | 21 | 5 | 5 | 3 | 3 | 2 | 2 |
| Marco de Gemmis | Program Chair (RecSys 2025); Workshop/Tutorial Chair (UMAP 2018); Doctoral Chair (RecSys 2024; UMAP 2013); Proceedings Chair (RecSys 2015) | Other Conference | 2015 | 2025 | 11 | 2013 | 2018 | 6 | 2013 | 2025 | 13 | 60 | 83 | 46 | 40 | 5 | 2 | 3 | 2 | 2 | 0 |
| Elisabeth Lex | Track Chair (UMAP 2022, 2024); Workshop Chair (ECIR 2024); Tutorial Chair (RecSys 2025); Doctoral Chair (RecSys 2024) | Other Conference | 2024 | 2025 | 2 | 2022 | 2024 | 3 | 2022 | 2025 | 4 | 60 | 30 | 69 | 40 | 5 | 5 | 2 | 2 | 3 | 3 |
| Katrien Verbert | Program Chair (RecSys 2024); Track Chair (UMAP 2019, 2021, 2023); Demo/LBR Chair (RecSys 2021) | Other Conference | 2021 | 2024 | 4 | 2019 | 2023 | 5 | 2019 | 2024 | 6 | 60 | 45 | 69 | 40 | 5 | 4 | 2 | 2 | 3 | 2 |
| Veronika Bogina | Workshop/Tutorial Chair (UMAP 2020, 2023); Demo/LBR Chair (UMAP 2022); Proceedings Chair (RecSys 2024, 2025) | Other Conference | 2024 | 2025 | 2 | 2020 | 2023 | 4 | 2020 | 2025 | 6 | 60 | 30 | 69 | 40 | 5 | 5 | 2 | 2 | 3 | 3 |
| Eva Zangerle | Track Chair (UMAP 2022, 2024); Workshop Chair (RecSys 2024); Doctoral Chair (UMAP 2026); Demo/LBR Chair (UMAP 2021) | Other Conference | 2024 | 2024 | 1 | 2021 | 2026 | 6 | 2021 | 2026 | 6 | 60 | 30 | 110 | 68 | 5 | 5 | 1 | 1 | 4 | 4 |
| Xiangnan He | Workshop Chair (CIKM 2025); Doctoral Chair (RecSys 2023; WSDM 2020); Short Paper Chair (SIGIR 2023); Sponsorship Chair (WSDM 2023) | Other Conference | 2023 | 2023 | 1 | 2020 | 2025 | 6 | 2020 | 2025 | 6 | 60 | 30 | 110 | 68 | 5 | 5 | 1 | 1 | 4 | 4 |
| Abhishek Srivastava | Challenge/Cup Chair (RecSys 2022, 2023, 2024, 2025) | ACM RecSys | 2022 | 2025 | 4 | 2022 | 2025 | 4 | 74 | 45 | 26 | 7 | 4 | 4 | 4 | 4 | 0 | 0 | |||
| Domonkos Tikk | Program Chair (RecSys 2019); Industry Chair (RecSys 2015); Doctoral Chair (RecSys 2011); Demo/LBR Chair (RecSys 2017) | ACM RecSys | 2011 | 2019 | 9 | 2011 | 2019 | 9 | 74 | 197 | 26 | 187 | 4 | 0 | 4 | 0 | 0 | 0 | |||
| Linus Dietz | Inclusion & Accessibility Chair (RecSys 2023); Web/Media Chair (RecSys 2020, 2021, 2022) | ACM RecSys | 2020 | 2023 | 4 | 2020 | 2023 | 4 | 74 | 45 | 26 | 7 | 4 | 4 | 4 | 4 | 0 | 0 | |||
| Martha Larson | General Chair (RecSys 2021); Workshop Chair (RecSys 2018); Tutorial Chair (RecSys 2017); Doctoral Chair (RecSys 2019) | ACM RecSys | 2017 | 2021 | 5 | 2017 | 2021 | 5 | 74 | 111 | 26 | 68 | 4 | 1 | 4 | 1 | 0 | 0 | |||
| Zhenhua Dong | Industry Chair (RecSys 2024, 2026); Sponsorship Chair (RecSys 2022, 2023) | ACM RecSys | 2022 | 2026 | 5 | 2022 | 2026 | 5 | 74 | 45 | 26 | 7 | 4 | 4 | 4 | 4 | 0 | 0 | |||
| Denis Parra | Track Chair (UMAP 2021); Workshop Chair (RecSys 2021); Tutorial Chair (RecSys 2019); Demo/LBR Chair (RecSys 2020) | ACM RecSys | 2019 | 2021 | 3 | 2021 | 2021 | 1 | 2019 | 2021 | 3 | 74 | 60 | 46 | 40 | 4 | 3 | 3 | 2 | 1 | 1 |
| Ludovik Çoba | Proceedings Chair (RecSys 2021); Reproducibility Chair (RecSys 2022); Sponsorship Chair (UMAP 2022); Student Chair (RecSys 2024) | ACM RecSys | 2021 | 2024 | 4 | 2022 | 2022 | 1 | 2021 | 2024 | 4 | 74 | 45 | 46 | 21 | 4 | 4 | 3 | 3 | 1 | 1 |
| Bracha Shapira | Program Chair (RecSys 2022); Doctoral Chair (RecSys 2018; WSDM 2021); Best Paper Chair (SIGIR 2023) | ACM RecSys | 2018 | 2022 | 5 | 2021 | 2023 | 3 | 2018 | 2023 | 6 | 74 | 60 | 69 | 68 | 4 | 3 | 2 | 1 | 2 | 2 |
| Giovanni Semeraro | General Chair (UMAP 2013); Program Chair (RecSys 2015); Workshop Chair (RecSys 2017); Finance/Registration Chair (SIGIR 2025) | Other Conference | 2015 | 2017 | 3 | 2013 | 2025 | 13 | 2013 | 2025 | 13 | 74 | 111 | 69 | 187 | 4 | 1 | 2 | 0 | 2 | 1 |
| Lien Michiels | Workshop/Tutorial Chair (UMAP 2026); Publicity Chair (RecSys 2024, 2025; UMAP 2025) | ACM RecSys | 2024 | 2025 | 2 | 2025 | 2026 | 2 | 2024 | 2026 | 3 | 74 | 45 | 69 | 40 | 4 | 4 | 2 | 2 | 2 | 2 |
| Markus Schedl | General Chair (RecSys 2025); Track Chair (UMAP 2018, 2019); Doctoral Chair (RecSys 2019) | Other Conference | 2019 | 2025 | 7 | 2018 | 2019 | 2 | 2018 | 2025 | 8 | 74 | 111 | 69 | 68 | 4 | 1 | 2 | 1 | 2 | 0 |
| Chirag Shah | General Chair (SIGIR 2021); Track Chair (SIGIR 2021); Workshop Chair (RecSys 2022); Short Paper Chair (SIGIR 2024) | Other Conference | 2022 | 2022 | 1 | 2021 | 2024 | 4 | 2021 | 2024 | 4 | 74 | 45 | 110 | 68 | 4 | 4 | 1 | 1 | 3 | 3 |
| Jie Zhang | General Chair (RecSys 2023; UMAP 2018); Track Chair (UMAP 2021); Workshop/Tutorial Chair (UMAP 2016) | Other Conference | 2023 | 2023 | 1 | 2016 | 2021 | 6 | 2016 | 2023 | 8 | 74 | 83 | 110 | 68 | 4 | 2 | 1 | 1 | 3 | 1 |
| Qiang Yang | General Chair (RecSys 2013); Track Chair (CIKM 2009); Best Paper Chair (WSDM 2015); Publicity Chair (WSDM 2011) | Other Conference | 2013 | 2013 | 1 | 2009 | 2015 | 7 | 2009 | 2015 | 7 | 74 | 197 | 110 | 187 | 4 | 0 | 1 | 0 | 3 | 0 |
| Wanling Cai | Proceedings Chair (UMAP 2023); Inclusion & Accessibility Chair (RecSys 2023); Publicity Chair (UMAP 2024); Web/Media Chair (UMAP 2026) | ACM RecSys & Other Conference | 2023 | 2023 | 1 | 2023 | 2026 | 4 | 2023 | 2026 | 4 | 74 | 45 | 110 | 68 | 4 | 4 | 1 | 1 | 3 | 3 |
| Ashmi Banerjee | Women’s Events Chair (RecSys 2023, 2024, 2025) | ACM RecSys | 2023 | 2025 | 3 | 2023 | 2025 | 3 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Bruce Ferwerda | Challenge/Cup Chair (RecSys 2021, 2022); Inclusion & Accessibility Chair (RecSys 2024) | ACM RecSys | 2021 | 2024 | 4 | 2021 | 2024 | 4 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Ding Tong | Sponsorship Chair (RecSys 2024, 2025, 2026) | ACM RecSys | 2024 | 2026 | 3 | 2024 | 2026 | 3 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Elizabeth M. Daly | Program Chair (RecSys 2020); Workshop Chair (RecSys 2016); Demo/LBR Chair (RecSys 2012) | ACM RecSys | 2012 | 2020 | 9 | 2012 | 2020 | 9 | 89 | 111 | 46 | 68 | 3 | 1 | 3 | 1 | 0 | 0 | |||
| Gediminas Adomavicius | General Chair (RecSys 2026); Program Chair (RecSys 2011); Doctoral Chair (RecSys 2015) | ACM RecSys | 2011 | 2026 | 16 | 2011 | 2026 | 16 | 89 | 111 | 46 | 68 | 3 | 1 | 3 | 1 | 0 | 0 | |||
| Giuseppe Spillo | Local Chair (RecSys 2024); Web/Media Chair (RecSys 2025, 2026) | ACM RecSys | 2024 | 2026 | 3 | 2024 | 2026 | 3 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Jennifer Golbeck | General Chair (RecSys 2022); Program Chair (RecSys 2015); Workshop Chair (RecSys 2021) | ACM RecSys | 2015 | 2022 | 8 | 2015 | 2022 | 8 | 89 | 83 | 46 | 40 | 3 | 2 | 3 | 2 | 0 | 0 | |||
| John Riedl | Program Chair (RecSys 2007); Workshop Chair (RecSys 2011); Doctoral Chair (RecSys 2010) | ACM RecSys | 2007 | 2011 | 5 | 2007 | 2011 | 5 | 89 | 197 | 46 | 187 | 3 | 0 | 3 | 0 | 0 | 0 | |||
| Karen Church | Industry Chair (RecSys 2016); Publicity Chair (RecSys 2012); Finance/Registration Chair (RecSys 2010) | ACM RecSys | 2010 | 2016 | 7 | 2010 | 2016 | 7 | 89 | 197 | 46 | 187 | 3 | 0 | 3 | 0 | 0 | 0 | |||
| Karlijn Dinnissen | Women’s Events Chair (RecSys 2024, 2025, 2026) | ACM RecSys | 2024 | 2026 | 3 | 2024 | 2026 | 3 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Marco Polignano | Reproducibility Chair (RecSys 2025); Challenge/Cup Chair (RecSys 2024, 2025) | ACM RecSys | 2024 | 2025 | 2 | 2024 | 2025 | 2 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Maurizio Ferrari Dacrema | Tutorial Chair (RecSys 2026); Demo/LBR Chair (RecSys 2024); Reproducibility Chair (RecSys 2025) | ACM RecSys | 2024 | 2026 | 3 | 2024 | 2026 | 3 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Pigi Kouki | Demo/LBR Chair (RecSys 2021, 2022, 2023) | ACM RecSys | 2021 | 2023 | 3 | 2021 | 2023 | 3 | 89 | 60 | 46 | 21 | 3 | 3 | 3 | 3 | 0 | 0 | |||
| Sandra Garcia | Workshop Chair (RecSys 2019); Tutorial Chair (RecSys 2018); Sponsorship Chair (RecSys 2021) | ACM RecSys | 2018 | 2021 | 4 | 2018 | 2021 | 4 | 89 | 111 | 46 | 68 | 3 | 1 | 3 | 1 | 0 | 0 | |||
| Adir Solomon | Demo/LBR Chair (RecSys 2025, 2026); Inclusion & Accessibility Chair (UMAP 2025) | ACM RecSys & Other Conference | 2025 | 2026 | 2 | 2025 | 2025 | 1 | 2025 | 2026 | 2 | 89 | 60 | 69 | 40 | 3 | 3 | 2 | 2 | 1 | 1 |
| George Karypis | General Chair (RecSys 2026); Program Chair (RecSys 2013); Best Paper Chair (WSDM 2023) | ACM RecSys | 2013 | 2026 | 14 | 2023 | 2023 | 1 | 2013 | 2026 | 14 | 89 | 83 | 69 | 68 | 3 | 2 | 2 | 1 | 1 | 1 |
| Mi Zhang | Workshop Chair (RecSys 2023); Publicity Chair (RecSys 2013; UMAP 2018) | ACM RecSys | 2013 | 2023 | 11 | 2018 | 2018 | 1 | 2013 | 2023 | 11 | 89 | 111 | 69 | 68 | 3 | 1 | 2 | 1 | 1 | 0 |
| Oana Inel | Inclusion & Accessibility Chair (RecSys 2024, 2025); Publicity Chair (UMAP 2021) | Other Conference | 2024 | 2025 | 2 | 2021 | 2021 | 1 | 2021 | 2025 | 5 | 89 | 60 | 69 | 40 | 3 | 3 | 2 | 2 | 1 | 1 |
| Toine Bogers | General Chair (RecSys 2019; UMAP 2026); Social Chair (RecSys 2020) | ACM RecSys | 2019 | 2020 | 2 | 2026 | 2026 | 1 | 2019 | 2026 | 8 | 89 | 83 | 69 | 68 | 3 | 2 | 2 | 1 | 1 | 1 |
| Tommaso Di Noia | General Chair (RecSys 2024); Program Chair (RecSys 2023); Sponsorship Chair (SIGIR 2025) | ACM RecSys | 2023 | 2024 | 2 | 2025 | 2025 | 1 | 2023 | 2025 | 3 | 89 | 60 | 69 | 40 | 3 | 3 | 2 | 2 | 1 | 1 |
| Abdigani Diriye | Workshop Chair (SIGIR 2021); Doctoral Chair (RecSys 2022); Short Paper Chair (SIGIR 2020) | Other Conference | 2022 | 2022 | 1 | 2020 | 2021 | 2 | 2020 | 2022 | 3 | 89 | 60 | 110 | 68 | 3 | 3 | 1 | 1 | 2 | 2 |
| Alfred Kobsa | General Chair (RecSys 2014); Program Chair (UMAP 2010); Track Chair (UMAP 2014) | Other Conference | 2014 | 2014 | 1 | 2010 | 2014 | 5 | 2010 | 2014 | 5 | 89 | 197 | 110 | 187 | 3 | 0 | 1 | 0 | 2 | 0 |
| Altigran Silva | Industry Chair (SIGIR 2022); Tutorial Chair (SIGIR 2023); Sponsorship Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2022 | 2023 | 2 | 2020 | 2023 | 4 | 89 | 60 | 110 | 68 | 3 | 3 | 1 | 1 | 2 | 2 |
| Amra Delić Halilović | Workshop/Tutorial Chair (UMAP 2024); Challenge/Cup Chair (RecSys 2020); Inclusion & Accessibility Chair (UMAP 2023) | ACM RecSys | 2020 | 2020 | 1 | 2023 | 2024 | 2 | 2020 | 2024 | 5 | 89 | 60 | 110 | 68 | 3 | 3 | 1 | 1 | 2 | 2 |
| Antonio Ferrara | Demo/LBR Chair (RecSys 2024); Proceedings Chair (UMAP 2025, 2026) | ACM RecSys | 2024 | 2024 | 1 | 2025 | 2026 | 2 | 2024 | 2026 | 3 | 89 | 60 | 110 | 68 | 3 | 3 | 1 | 1 | 2 | 2 |
| David Graus | Publicity Chair (ECIR 2014, 2026); Local Chair (RecSys 2021) | Other Conference | 2021 | 2021 | 1 | 2014 | 2026 | 13 | 2014 | 2026 | 13 | 89 | 83 | 110 | 68 | 3 | 2 | 1 | 1 | 2 | 1 |
| Neil Yorke-Smith | Proceedings Chair (RecSys 2023; UMAP 2018, 2019) | Other Conference | 2023 | 2023 | 1 | 2018 | 2019 | 2 | 2018 | 2023 | 6 | 89 | 111 | 110 | 68 | 3 | 1 | 1 | 1 | 2 | 0 |
| Xia Ning | Doctoral Chair (RecSys 2026); Proceedings Chair (CIKM 2016, 2017) | Other Conference | 2026 | 2026 | 1 | 2016 | 2017 | 2 | 2016 | 2026 | 11 | 89 | 111 | 110 | 68 | 3 | 1 | 1 | 1 | 2 | 0 |
| Yang Song | Track Chair (CIKM 2025); Industry Chair (RecSys 2023); Challenge/Cup Chair (WSDM 2023) | ACM RecSys & Other Conference | 2023 | 2023 | 1 | 2023 | 2025 | 3 | 2023 | 2025 | 3 | 89 | 60 | 110 | 68 | 3 | 3 | 1 | 1 | 2 | 2 |
| Amifa Raj | Student Chair (RecSys 2022, 2023) | ACM RecSys | 2022 | 2023 | 2 | 2022 | 2023 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Cynthia Liem | Inclusion & Accessibility Chair (RecSys 2021, 2022) | ACM RecSys | 2021 | 2022 | 2 | 2021 | 2022 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Elena Epure | Women’s Events Chair (RecSys 2025, 2026) | ACM RecSys | 2025 | 2026 | 2 | 2025 | 2026 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Even Oldridge | Industry Chair (RecSys 2021, 2022) | ACM RecSys | 2021 | 2022 | 2 | 2021 | 2022 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Fernando Mourão | Proceedings Chair (RecSys 2020, 2023) | ACM RecSys | 2020 | 2023 | 4 | 2020 | 2023 | 4 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Francesco Barile | Challenge/Cup Chair (RecSys 2025, 2026) | ACM RecSys | 2025 | 2026 | 2 | 2025 | 2026 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Francisco J. Martin | Industry Chair (RecSys 2007, 2008) | ACM RecSys | 2007 | 2008 | 2 | 2007 | 2008 | 2 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Jill Freyne | Program Chair (RecSys 2016); Workshop Chair (RecSys 2012) | ACM RecSys | 2012 | 2016 | 5 | 2012 | 2016 | 5 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| João Vinagre | Proceedings Chair (RecSys 2023, 2024) | ACM RecSys | 2023 | 2024 | 2 | 2023 | 2024 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Joey De Pauw | Web/Media Chair (RecSys 2023, 2024) | ACM RecSys | 2023 | 2024 | 2 | 2023 | 2024 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Justin Basilico | Industry Chair (RecSys 2022, 2023) | ACM RecSys | 2022 | 2023 | 2 | 2022 | 2023 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Linas Baltrunas | Industry Chair (RecSys 2017); Sponsorship Chair (RecSys 2021) | ACM RecSys | 2017 | 2021 | 5 | 2017 | 2021 | 5 | 118 | 111 | 69 | 68 | 2 | 1 | 2 | 1 | 0 | 0 | |||
| Michael O’Mahony | Doctoral Chair (RecSys 2009, 2012) | ACM RecSys | 2009 | 2012 | 4 | 2009 | 2012 | 4 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Paul Lamere | Industry Chair (RecSys 2009, 2016) | ACM RecSys | 2009 | 2016 | 8 | 2009 | 2016 | 8 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Paul Resnick | Program Chair (RecSys 2010); Doctoral Chair (RecSys 2009) | ACM RecSys | 2009 | 2010 | 2 | 2009 | 2010 | 2 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Steven Bourke | Sponsorship Chair (RecSys 2020, 2021) | ACM RecSys | 2020 | 2021 | 2 | 2020 | 2021 | 2 | 118 | 83 | 69 | 40 | 2 | 2 | 2 | 2 | 0 | 0 | |||
| Susan Crow | Local Chair (RecSys 2014); Finance/Registration Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Tim Hussein | Publicity Chair (RecSys 2013, 2014) | ACM RecSys | 2013 | 2014 | 2 | 2013 | 2014 | 2 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Xavier Amatriain | General Chair (RecSys 2010); Program Chair (RecSys 2018) | ACM RecSys | 2010 | 2018 | 9 | 2010 | 2018 | 9 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Yashar Deldjoo | Demo/LBR Chair (RecSys 2024); Challenge/Cup Chair (RecSys 2019) | ACM RecSys | 2019 | 2024 | 6 | 2019 | 2024 | 6 | 118 | 111 | 69 | 68 | 2 | 1 | 2 | 1 | 0 | 0 | |||
| Yehuda Koren | Program Chair (RecSys 2014); Industry Chair (RecSys 2011) | ACM RecSys | 2011 | 2014 | 4 | 2011 | 2014 | 4 | 118 | 197 | 69 | 187 | 2 | 0 | 2 | 0 | 0 | 0 | |||
| Alberto Carlo Maria Mancino | Student Chair (UMAP 2025); Local Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2025 | 2025 | 1 | 2024 | 2025 | 2 | 118 | 83 | 110 | 68 | 2 | 2 | 1 | 1 | 1 | 1 |
| Chao Huang | Demo/LBR Chair (RecSys 2023); Challenge/Cup Chair (WSDM 2024) | ACM RecSys | 2023 | 2023 | 1 | 2024 | 2024 | 1 | 2023 | 2024 | 2 | 118 | 83 | 110 | 68 | 2 | 2 | 1 | 1 | 1 | 1 |
| Daniela Godoy | Track Chair (UMAP 2023); Workshop Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2023 | 2023 | 1 | 2022 | 2023 | 2 | 118 | 83 | 110 | 68 | 2 | 2 | 1 | 1 | 1 | 1 |
| David Elsweiler | Track Chair (UMAP 2019); Publicity Chair (RecSys 2017) | ACM RecSys | 2017 | 2017 | 1 | 2019 | 2019 | 1 | 2017 | 2019 | 3 | 118 | 197 | 110 | 187 | 2 | 0 | 1 | 0 | 1 | 0 |
| Edleno Moura | Industry Chair (RecSys 2020); Reproducibility Chair (ECIR 2020) | ACM RecSys & Other Conference | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 118 | 83 | 110 | 68 | 2 | 2 | 1 | 1 | 1 | 1 |
| Farshad Bakhshandegan Moghaddam | Proceedings Chair (UMAP 2021); Challenge/Cup Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2021 | 2021 | 1 | 2019 | 2021 | 3 | 118 | 111 | 110 | 187 | 2 | 1 | 1 | 0 | 1 | 1 |
| Guibing Guo | Publicity Chair (RecSys 2023; UMAP 2018) | Other Conference | 2023 | 2023 | 1 | 2018 | 2018 | 1 | 2018 | 2023 | 6 | 118 | 111 | 110 | 68 | 2 | 1 | 1 | 1 | 1 | 0 |
| Hong Cheng | Proceedings Chair (WSDM 2011); Finance/Registration Chair (RecSys 2013) | Other Conference | 2013 | 2013 | 1 | 2011 | 2011 | 1 | 2011 | 2013 | 3 | 118 | 197 | 110 | 187 | 2 | 0 | 1 | 0 | 1 | 0 |
| Ladislav Peška | Track Chair (UMAP 2024); Student Chair (RecSys 2025) | Other Conference | 2025 | 2025 | 1 | 2024 | 2024 | 1 | 2024 | 2025 | 2 | 118 | 83 | 110 | 68 | 2 | 2 | 1 | 1 | 1 | 1 |
| Marc Torrens | General Chair (RecSys 2010); Industry Chair (UMAP 2011) | ACM RecSys | 2010 | 2010 | 1 | 2011 | 2011 | 1 | 2010 | 2011 | 2 | 118 | 197 | 110 | 187 | 2 | 0 | 1 | 0 | 1 | 0 |
| Marta Moscati | Proceedings Chair (RecSys 2025); Publicity Chair (UMAP 2026) | ACM RecSys | 2025 | 2025 | 1 | 2026 | 2026 | 1 | 2025 | 2026 | 2 | 118 | 83 | 110 | 68 | 2 | 2 | 1 | 1 | 1 | 1 |
| Mehdi Elahi | Proceedings Chair (RecSys 2017; UMAP 2021) | ACM RecSys | 2017 | 2017 | 1 | 2021 | 2021 | 1 | 2017 | 2021 | 5 | 118 | 111 | 110 | 187 | 2 | 1 | 1 | 0 | 1 | 1 |
| Michal Kompan | Reproducibility Chair (RecSys 2025); Student Chair (UMAP 2017) | Other Conference | 2025 | 2025 | 1 | 2017 | 2017 | 1 | 2017 | 2025 | 9 | 118 | 111 | 110 | 68 | 2 | 1 | 1 | 1 | 1 | 0 |
| Peter Knees | Track Chair (UMAP 2023); Challenge/Cup Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2023 | 2023 | 1 | 2019 | 2023 | 5 | 118 | 111 | 110 | 187 | 2 | 1 | 1 | 0 | 1 | 1 |
| Qing Li | General Chair (RecSys 2013); Tutorial Chair (WSDM 2011) | Other Conference | 2013 | 2013 | 1 | 2011 | 2011 | 1 | 2011 | 2013 | 3 | 118 | 197 | 110 | 187 | 2 | 0 | 1 | 0 | 1 | 0 |
| Zhu Sun | Local Chair (RecSys 2023; UMAP 2018) | Other Conference | 2023 | 2023 | 1 | 2018 | 2018 | 1 | 2018 | 2023 | 6 | 118 | 111 | 110 | 68 | 2 | 1 | 1 | 1 | 1 | 0 |
| Abhinav Bohra | Challenge/Cup Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Agustin Casamayor | Publicity Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Alan Hanjalic | Tutorial Chair (RecSys 2021) | ACM RecSys | 2021 | 2021 | 1 | 2021 | 2021 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Alessandro Petruzzelli | Local Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Alexandros Nanopoulos | Liaison Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Alison Baerwald | Local Chair (RecSys 2007) | ACM RecSys | 2007 | 2007 | 1 | 2007 | 2007 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Allison Chaney | Workshop Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Amanda Aird | Student Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Amit Sharma | Demo/LBR Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Amy Zhang | Student Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Andrés Segura-Tinoco | Student Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Anisio Lacerda | Tutorial Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Anmol Bhasin | Industry Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Athirai Irissappane | Challenge/Cup Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Ayoub El Majjodi | Proceedings Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Badrul Sarwar | Workshop Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Barry Smyth | Program Chair (RecSys 2007) | ACM RecSys | 2007 | 2007 | 1 | 2007 | 2007 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Bart Goethals | Program Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Bee-Chung Chen | Tutorial Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Ben Frederickson | Industry Chair (RecSys 2018) | ACM RecSys | 2018 | 2018 | 1 | 2018 | 2018 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Ben London | Industry Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Bouke Huurnink | Industry Chair (RecSys 2021) | ACM RecSys | 2021 | 2021 | 1 | 2021 | 2021 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Carla Delgado | Local Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Caroline Chavier | Inclusion & Accessibility Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2019 | 2019 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Casey Dugan | Social Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Casper Petersen | Local Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2019 | 2019 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Chi Yin Chow | Local Chair (RecSys 2013) | ACM RecSys | 2013 | 2013 | 1 | 2013 | 2013 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Chris Barklem | Web/Media Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Christian Posse | Industry Chair (RecSys 2013) | ACM RecSys | 2013 | 2013 | 1 | 2013 | 2013 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Christoph Grün | Local Chair (RecSys 2015) | ACM RecSys | 2015 | 2015 | 1 | 2015 | 2015 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Cliff Lampe | Finance/Registration Chair (RecSys 2007) | ACM RecSys | 2007 | 2007 | 1 | 2007 | 2007 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Cong Zhang | Local Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| David Karger | Liaison Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Derek Bridge | Short Paper Chair (RecSys 2008) | ACM RecSys | 2008 | 2008 | 1 | 2008 | 2008 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Dong Zhang | Liaison Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Ehsan Iranmanesh | Student Chair (RecSys 2018) | ACM RecSys | 2018 | 2018 | 1 | 2018 | 2018 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Elio Musacchio | Local Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Emanuele Rabosio | Local Chair (RecSys 2017) | ACM RecSys | 2017 | 2017 | 1 | 2017 | 2017 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Esteve Almirall | Liaison Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Felice Antonio Merra | Industry Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Flávio Figueiredo | Publicity Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Gabriele Sottocornola | Challenge/Cup Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Gaetano Dibenedetto | Local Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Gauri Sarode | Sponsorship Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Hanna Schäfer | Proceedings Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2019 | 2019 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Hannes Werthner | General Chair (RecSys 2015) | ACM RecSys | 2015 | 2015 | 1 | 2015 | 2015 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Hrishi Aradhye | Industry Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Jalal Mahmud | Demo/LBR Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Jean Garcia-Gathright | Industry Chair (RecSys 2021) | ACM RecSys | 2021 | 2021 | 1 | 2021 | 2021 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Jessie Smith | Challenge/Cup Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Jian Wang | Local Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| João Paulo Dias de Almeida | Web/Media Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Joaquin Quiñonero Candela | Industry Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Joeran Beel | General Chair (RecSys 2027) | ACM RecSys | 2027 | 2027 | 1 | 2027 | 2027 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| John Ciancutti | Industry Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| John O’Donovan | Program Chair (RecSys 2018) | ACM RecSys | 2018 | 2018 | 1 | 2018 | 2018 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Jonathan Wareham | Liaison Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Jussara Almeida | Workshop Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Keld Lundgaard | Industry Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Konstantin Bauman | Proceedings Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Lars Schmidt-Thieme | Program Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Lawrence Bergman | General Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Le Wu | Demo/LBR Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Leandro Balby Marinho | General Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Leonardo Cella | Student Chair (RecSys 2017) | ACM RecSys | 2017 | 2017 | 1 | 2017 | 2017 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Lior Rokach | Workshop Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Loren Terveen | Doctoral Chair (RecSys 2007) | ACM RecSys | 2007 | 2007 | 1 | 2007 | 2007 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Lorraine McGinty | Publicity Chair (RecSys 2008) | ACM RecSys | 2008 | 2008 | 1 | 2008 | 2008 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Lu Zhang | Student Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Luiz Pizzato | Industry Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Magdalini Eirinaki | Reproducibility Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Mahamudul Hasan | Proceedings Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Manel Slokom | Student Chair (RecSys 2021) | ACM RecSys | 2021 | 2021 | 1 | 2021 | 2021 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Mara Abel | Liaison Chair (RecSys 2007) | ACM RecSys | 2007 | 2007 | 1 | 2007 | 2007 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Marcel Hauck | Student Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Marcelo Manzato | Doctoral Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Marijn Koolen | Workshop Chair (RecSys 2021) | ACM RecSys | 2021 | 2021 | 1 | 2021 | 2021 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Marion Scholz | Local Chair (RecSys 2015) | ACM RecSys | 2015 | 2015 | 1 | 2015 | 2015 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Mark Graus | Publicity Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2019 | 2019 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Martin Ester | Program Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Martin Spisak | Local Chair (RecSys 2025) | ACM RecSys | 2025 | 2025 | 1 | 2025 | 2025 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Max Harper | General Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Merry Morse | Local Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Michelle Zhou | General Chair (RecSys 2014) | ACM RecSys | 2014 | 2014 | 1 | 2014 | 2014 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Minmin Chen | Program Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Mohammad Tayebi | Student Chair (RecSys 2018) | ACM RecSys | 2018 | 2018 | 1 | 2018 | 2018 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Moshe Unger | Workshop Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Naomi Ranjbar Kermany | Sponsorship Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Natascha Zachs | Finance/Registration Chair (RecSys 2015) | ACM RecSys | 2015 | 2015 | 1 | 2015 | 2015 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Nazareno Andrade | Challenge/Cup Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Neil Hurley | General Chair (RecSys 2012) | ACM RecSys | 2012 | 2012 | 1 | 2012 | 2012 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Núria Agell | Liaison Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Oscar Celma | Publicity Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Pádraig Cunningham | General Chair (RecSys 2012) | ACM RecSys | 2012 | 2012 | 1 | 2012 | 2012 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Pan Li | Publicity Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Panagiotis Symeonidis | Publicity Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Pavel Kordik | General Chair (RecSys 2025) | ACM RecSys | 2025 | 2025 | 1 | 2025 | 2025 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Petr Kasalicky | Local Chair (RecSys 2025) | ACM RecSys | 2025 | 2025 | 1 | 2025 | 2025 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Puya Vahabi | Sponsorship Chair (RecSys 2017) | ACM RecSys | 2017 | 2017 | 1 | 2017 | 2017 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Qian Xu | Publicity Chair (RecSys 2013) | ACM RecSys | 2013 | 2013 | 1 | 2013 | 2013 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Qian Zhao | Proceedings Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Rodrigo Alves | Industry Chair (RecSys 2025) | ACM RecSys | 2025 | 2025 | 1 | 2025 | 2025 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Rong Zheng | Demo/LBR Chair (RecSys 2013) | ACM RecSys | 2013 | 2013 | 1 | 2013 | 2013 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Ruiming Tang | Demo/LBR Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Ruixuan (Sophia) Sun | Demo/LBR Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Ruth Garcia | Local Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Sarabjot Singh Anand | Program Chair (RecSys 2012) | ACM RecSys | 2012 | 2012 | 1 | 2012 | 2012 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Saul Vargas | Proceedings Chair (RecSys 2018) | ACM RecSys | 2018 | 2018 | 1 | 2018 | 2018 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Sean McNee | Workshop Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Shail Patel | Industry Chair (RecSys 2008) | ACM RecSys | 2008 | 2008 | 1 | 2008 | 2008 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Shilad Sen | General Chair (RecSys 2016) | ACM RecSys | 2016 | 2016 | 1 | 2016 | 2016 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Shuo (Steven) Chang | Demo/LBR Chair (RecSys 2018) | ACM RecSys | 2018 | 2018 | 1 | 2018 | 2018 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Simon Dooms | Publicity Chair (RecSys 2013) | ACM RecSys | 2013 | 2013 | 1 | 2013 | 2013 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Stefano Cereda | Student Chair (RecSys 2017) | ACM RecSys | 2017 | 2017 | 1 | 2017 | 2017 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Steffen Rendle | Publicity Chair (RecSys 2011) | ACM RecSys | 2011 | 2011 | 1 | 2011 | 2011 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Sushmita Khan | Inclusion & Accessibility Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Tao Wang | Industry Chair (RecSys 2019) | ACM RecSys | 2019 | 2019 | 1 | 2019 | 2019 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Tao Zhou | Industry Chair (RecSys 2013) | ACM RecSys | 2013 | 2013 | 1 | 2013 | 2013 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Thanos Nikolakopoulos | Local Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Thorsten Joachims | Program Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Verus Pronk | Industry Chair (RecSys 2011) | ACM RecSys | 2011 | 2011 | 1 | 2011 | 2011 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Victor Sheng | Workshop Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Vikas Kumar | Local Chair (RecSys 2022) | ACM RecSys | 2022 | 2022 | 1 | 2022 | 2022 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Vincenzo Paparella | Local Chair (RecSys 2024) | ACM RecSys | 2024 | 2024 | 1 | 2024 | 2024 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Vito Ostuni | Industry Chair (RecSys 2025) | ACM RecSys | 2025 | 2025 | 1 | 2025 | 2025 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Vojtech Vancura | Local Chair (RecSys 2025) | ACM RecSys | 2025 | 2025 | 1 | 2025 | 2025 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Weike Pan | Tutorial Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Windson Viana | Student Chair (RecSys 2020) | ACM RecSys | 2020 | 2020 | 1 | 2020 | 2020 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Xavier Anguera | Local Chair (RecSys 2010) | ACM RecSys | 2010 | 2010 | 1 | 2010 | 2010 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Xu Chen | Sponsorship Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Yong Liu | Challenge/Cup Chair (RecSys 2023) | ACM RecSys | 2023 | 2023 | 1 | 2023 | 2023 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Yuan Chun Shi | Liaison Chair (RecSys 2008) | ACM RecSys | 2008 | 2008 | 1 | 2008 | 2008 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Zan Huang | Publicity Chair (RecSys 2009) | ACM RecSys | 2009 | 2009 | 1 | 2009 | 2009 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
| Zannatun Naim Sristy | Web/Media Chair (RecSys 2026) | ACM RecSys | 2026 | 2026 | 1 | 2026 | 2026 | 1 | 155 | 111 | 110 | 68 | 1 | 1 | 1 | 1 | 0 | 0 | |||
| Zeno Gantner | Publicity Chair (RecSys 2011) | ACM RecSys | 2011 | 2011 | 1 | 2011 | 2011 | 1 | 155 | 197 | 110 | 187 | 1 | 0 | 1 | 0 | 0 | 0 | |||
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Green Recommender-Systems at ACM RecSys 2024
Dietmar Jannach is featured by “People of ACM”
Green Recommender Systems: A Call for Attention
About The Author
Joeran Beel
I am the founder of Recommender-Systems.com and head of the Intelligent Systems Group (ISG) at the University of Siegen, Germany https://isg.beel.org. We conduct research in recommender-systems (RecSys), personalization and information retrieval (IR) as well as on automated machine learning (AutoML), meta-learning and algorithm selection. Domains we are particularly interested in include smart places, eHealth, manufacturing (industry 4.0), mobility, visual computing, and digital libraries. We founded or maintain, among others, LensKit-Auto, Darwin & Goliath, Mr. DLib, and Docear, each with thousand of users; we contributed to TensorFlow, JabRef and others; and we developed the first prototypes of automated recommender systems (AutoSurprise and Auto-CaseRec) and Federated Meta Learning (FMLearn Server and Client).