| Fateme Abbasi | University of Wroclaw | 10.10.2021 – 20.11.2021 |
| Ahmad Abdi | London School of Economics and Political Science | 27.10.2021 – 06.11.2021 |
| Xavier Allamigeon | INRIA and Ecole Polytechnique | 10.09.2021 – 10.10.2021 |
| Kristóf Bérczi | Eötvös Loránd University | 14.11.2021 – 27.11.2021 |
| Alexander Black | UC Davis | 19.09.2021 – 27.09.2021 |
| Jan van den Brand | KTH Royal Institute of Technology | 03.10.2021 – 24.10.2021 |
| Marie-Charlotte Brandenburg | Max-Planck-Institut für Mathematik in den Naturwissenschaften | 07.11.2021 – 13.11.2021 |
| Marco Caoduro | UGA - GSCOP Laboratory | 20.10.2021 – 06.11.2021 |
| Deeparnab Chakrabarty | Dartmouth College | 10.09.2021 – 20.10.2021 |
| Parinya Chalermsook | Department of Computer Science Aalto University | 11.09.2021 – 09.10.2021 |
| 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 |
| Jesus De Loera | University of California | 19.09.2021 – 30.09.2021 |
| Sally Dong | University of Washington | 03.10.2021 – 17.12.2021 |
| Anne Driemel | Universität Bonn | |
| Franziska Eberle | LSE London | 10.10.2021 – 03.12.2021 |
| Fritz Eisenbrand | EPFL | 18.09.2021 – 22.09.2021 |
| Fritz Eisenbrand | EPFL | 14.11.2021 – 16.11.2021 |
| 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 | 10.10.2021 – 23.10.2021 |
| Samuel Fiorini | Université libre de Bruxelles | 12.11.2021 – 20.11.2021 |
| Samuel Fiorini | Université libre de Bruxelles | 05.12.2021 – 09.12.2021 |
| Fedor Fomin | Institutt for informatikk | 15.11.2021 – 11.12.2021 |
| Michel Goemans | MIT | 12.11.2021 – 20.11.2021 |
| Fabrizio Grandoni | IDSIA, USI-SUPSI | 14.11.2021 – 19.11.2021 |
| Carla Groenland | Utrecht University | 23.11.2021 – 17.12.2021 |
| Stephan Held | Universität Bonn | |
| Christoph Hertrich | Technische Universität Berlin | 24.10.2021 – 06.11.2021 |
| Hung Hoang | ETH Zurich | 08.11.2021 – 03.12.2021 |
| Stefan Hougardy | Universität Bonn | |
| Sophie Huiberts | Centrum Wiskunde & Informatica | 10.10.2021 – 13.11.2021 |
| Christoph Hunkenschröder | TU Berlin | 01.11.2021 – 17.12.2021 |
| Haotian Jiang | University of Washington | 23.09.2021 – 20.10.2021 |
| Michael Joswig | TU Berlin | 27.09.2021 – 01.10.2021 |
| Thomas Kesselheim | Universität Bonn | |
| Kim-Manuel Klein | University of Kiel | 22.11.2021 – 11.12.2021 |
| Nathan Klein | University of Washington | 10.09.2021 – 21.11.2021 |
| 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 |
| Rasmus Kyng | ETH Zurich | 10.10.2021 – 21.11.2021 |
| 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 |
| Nicole Megow | University of Bremen | 11.10.2021 – 15.10.2021 |
| Nicole Megow | University of Bremen | 15.11.2021 – 19.11.2021 |
| Matthias Mnich | Hamburg University of Technology | 06.09.2021 – 17.12.2021 |
| Bento Natura | London School of Economics and Political Science | 10.09.2021 – 17.12.2021 |
| Martin Nägele | Universität Bonn | 24.10.2021 – 06.11.2021 |
| Jesper Nederlof | Utrecht University | 06.09.2021 – 17.12.2021 |
| Alantha Newman | Laboratoire G-SCOP | 15.09.2021 – 11.12.2021 |
| Neil Olver | LSE London | 06.09.2021 – 03.12.2021 |
| Britta Peis | RWTH Aachen University | 20.09.2021 – 01.10.2021 |
| Britta Peis | RWTH Aachen University | 15.11.2021 – 19.11.2021 |
| Michał Pilipczuk | University of Warsaw | 06.09.2021 – 29.10.2021 |
| 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 | 06.09.2021 – 18.09.2021 |
| Adam Polak | EPFL | 15.11.2021 – 11.12.2021 |
| Heiko Röglin | Universität Bonn | |
| Thomas Rothvoss | University of Washington | 14.11.2021 – 26.11.2021 |
| Vibha Sahlot | Charles University | 30.10.2021 – 18.12.2021 |
| Laura Sanità | TU Eindhoven | 06.09.2021 – 17.12.2021 |
| András Sebő | CNRS, Laboratoire G-SCOP, UNIV Grenoble-Alpes | 31.10.2021 – 30.11.2021 |
| Aaron Sidford | Stanford Uniiversity | 13.09.2021 – 13.09.2021 |
| Aaron Sidford | Stanford Uniiversity | 11.10.2021 – 20.10.2021 |
| Karl Stickler | London School of Economics and Political Science | 26.10.2021 – 30.10.2021 |
| Ola Svensson | EPFL | 12.10.2021 – 14.10.2021 |
| Céline Swennenhuis | Eindhoven University of Technology | 14.11.2021 – 15.12.2021 |
| Vera Traub | ETH | 02.10.2021 – 30.10.2021 |
| Vera Traub | ETH | 14.11.2021 – 10.12.2021 |
| Thorben Tröbst | University of California, Irvine | 24.10.2021 – 13.11.2021 |
| Laura Vargas Koch | ETH Zürich | 15.11.2021 – 03.12.2021 |
| László Végh | LSE London | 01.09.2021 – 28.11.2021 |
| 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 |
| Stefan Weltge | Technische Universität München | 19.09.2021 – 22.09.2021 |
| Stefan Weltge | Technische Universität München | 10.10.2021 – 15.10.2021 |
| Stephen Wright | University of Wisconsin-Madison | 10.10.2021 – 24.10.2021 |
| Fei Wu | KU Leuven | 18.09.2021 – 12.12.2021 |
| Sorrachai Yingchareonthawornchai | Aalto University | 12.09.2021 – 17.12.2021 |
| Rico Zenklusen | ETH Zurich | 13.09.2021 – 13.09.2021 |
| Rico Zenklusen | ETH Zurich | 10.10.2021 – 15.10.2021 |
