| Hans Bodlaender | Utrecht University | 05.12.2021 – 10.12.2021 |
| Parinya Chalermsook | Department of Computer Science Aalto University | 20.11.2021 – 18.12.2021 |
| Karthekeyan Chandrasekaran | University of Illinois, Urbana-Champaign | 12.11.2021 – 19.12.2021 |
| Gerard Cornuejols | Carnegie Mellon University | 06.09.2021 – 10.12.2021 |
| Jana Cslovjecsek | EPFL | 07.09.2021 – 11.12.2021 |
| Daniel Dadush | CWI | 07.09.2021 – 24.12.2021 |
| Sally Dong | University of Washington | 03.10.2021 – 17.12.2021 |
| Fritz Eisenbrand | EPFL | 05.12.2021 – 09.12.2021 |
| Andreas Feldmann | Charles University | 14.11.2021 – 11.12.2021 |
| Samuel Fiorini | Université libre de Bruxelles | 05.12.2021 – 09.12.2021 |
| Fedor Fomin | Institutt for informatikk | 15.11.2021 – 11.12.2021 |
| Petr Golovach | University of Bergen | 05.12.2021 – 11.12.2021 |
| Carla Groenland | Utrecht University | 23.11.2021 – 17.12.2021 |
| Christoph Hunkenschröder | TU Berlin | 01.11.2021 – 17.12.2021 |
| Kim-Manuel Klein | University of Kiel | 22.11.2021 – 11.12.2021 |
| Zhuan Khye Koh | London School of Economics and Political Science | 06.09.2021 – 17.12.2021 |
| Tuukka Korhonen | University of Bergen | 21.11.2021 – 11.12.2021 |
| Alexandra Lassota | EPFL | 21.11.2021 – 16.12.2021 |
| Roie Levin | Carnegie Mellon University | 30.09.2021 – 11.12.2021 |
| Georg Loho | University of Twente | 06.09.2021 – 17.12.2021 |
| Matthias Mnich | Hamburg University of Technology | 06.09.2021 – 17.12.2021 |
| Sarah Morell | Technische Universität Berlin | 05.12.2021 – 10.12.2021 |
| Bento Natura | London School of Economics and Political Science | 10.09.2021 – 17.12.2021 |
| Jesper Nederlof | Utrecht University | 06.09.2021 – 17.12.2021 |
| Alantha Newman | Laboratoire G-SCOP | 15.09.2021 – 11.12.2021 |
| Marcin Pilipczuk | University of Warsaw | 05.12.2021 – 10.12.2021 |
| Michał Pilipczuk | University of Warsaw | 05.12.2021 – 11.12.2021 |
| Sebastian Pokutta | Zuse Institut Berlin | 06.09.2021 – 17.12.2021 |
| Adam Polak | EPFL | 15.11.2021 – 11.12.2021 |
| Lars Rohwedder | EPFL | 06.12.2021 – 10.12.2021 |
| Vibha Sahlot | Charles University | 30.10.2021 – 18.12.2021 |
| Laura Sanità | TU Eindhoven | 06.09.2021 – 17.12.2021 |
| Céline Swennenhuis | Eindhoven University of Technology | 14.11.2021 – 15.12.2021 |
| Vera Traub | ETH | 14.11.2021 – 10.12.2021 |
| Jens Vygen | Universität Bonn | 06.09.2021 – 17.12.2021 |
| Karol Wegrzycki | Saarland University and Max Planck Institute for Informatics | 06.09.2021 – 17.12.2021 |
| Fei Wu | KU Leuven | 18.09.2021 – 12.12.2021 |
| Sorrachai Yingchareonthawornchai | Aalto University | 12.09.2021 – 17.12.2021 |
