| Jitendra Bajpai | TU Dresden | 30.05.2021 – 30.06.2021 |
| Christian Bernert | University of Göttingen | 03.05.2021 – 26.06.2021 |
| Constantin Bilz | University of Birmingham | 03.05.2021 – 24.07.2021 |
| Valentin Blomer | Universität Bonn | |
| Cynthia Bortolotto | ETH Zürich | 03.06.2021 – 26.06.2021 |
| Julia Brandes | Chalmers / University of Gothenburg | 27.06.2021 – 15.08.2021 |
| Claire Burrin | ETH Zurich | 27.06.2021 – 20.08.2021 |
| Paul Buterus | Bielefeld University | 26.06.2021 – 20.08.2021 |
| Alan Chang | Washington University in St. Louis | 30.05.2021 – 26.06.2021 |
| Mateus Costa de Sousa | Basque Center for Applied Mathematics | 03.05.2021 – 26.06.2021 |
| Jaume de Dios Pont | ETHZ | 05.05.2021 – 26.06.2021 |
| Jaume de Dios Pont | ETHZ | 01.08.2021 – 20.08.2021 |
| Kevin Destagnol | Université Paris Saclay | 21.06.2021 – 30.07.2021 |
| Robert Fraser | University of Edinburgh | 27.06.2021 – 31.07.2021 |
| Javier Fresán | Sorbonne Université | 25.07.2021 – 20.08.2021 |
| Ayla Gafni | University of Mississippi | 03.05.2021 – 10.07.2021 |
| João Pedro Gonçalves Ramos | ETH Zürich | 03.06.2021 – 26.06.2021 |
| Rachel Greenfeld | Institute for Advanced Study | 29.06.2021 – 19.08.2021 |
| Rok Havlas | University of Göttingen | 05.07.2021 – 20.08.2021 |
| Harald Andres Helfgott | Georg-August Universität Göttingen | 03.05.2021 – 29.05.2021 |
| Leonhard Hochfilzer | University of Göttingen | 03.05.2021 – 29.05.2021 |
| Kevin Hughes | University of Bristol | 03.05.2021 – 26.06.2021 |
| Marina Iliopoulou | University of Birmingham | 06.05.2021 – 20.08.2021 |
| Hongki Jung | Indiana University | 25.07.2021 – 20.08.2021 |
| Miriam Sophie Kaesberg | Georg-August Universtität Göttingen | 30.05.2021 – 26.06.2021 |
| Emmanuel Kowalski | ETH Zürich | 01.08.2021 – 08.08.2021 |
| Erez Lapid | Weizmann Institute of Science | 30.06.2021 – 29.07.2021 |
| Didier Lesesvre | Sun Yat-Sen University | 29.05.2021 – 26.06.2021 |
| Zane Li | Indiana University Bloomington | 20.06.2021 – 10.07.2021 |
| Yongxiao Lin | EPFL | 30.06.2021 – 20.08.2021 |
| Akos Magyar | University of Georgia | 20.06.2021 – 10.07.2021 |
| Jasmin Matz | University of Copenhagen | 04.07.2021 – 31.07.2021 |
| Philippe Michel | Ecole Polytechnique Federale de Lausanne (EPFL) | 13.06.2021 – 02.07.2021 |
| Bart Michels | Université Sorbonne Paris Nord | 27.06.2021 – 21.08.2021 |
| Diogo Oliveira e Silva | University of Birmingham | 02.05.2021 – 05.07.2021 |
| Andrea Olivo | International Centre for Theoretical Physics (ICTP) | 05.06.2021 – 20.08.2021 |
| Sarah Peluse | Princeton University | 04.07.2021 – 17.08.2021 |
| Olivier Ramaré | CNRS / Université Aix-Marseille | 30.05.2021 – 26.06.2021 |
| Joris Roos | University of Massachusetts Lowell | 06.06.2021 – 20.07.2021 |
| Alisa Sedunova | Saint Petersburg State Univercity | 27.06.2021 – 20.08.2021 |
| Andreas Seeger | University of Wisconsin-Madison | 14.06.2021 – 02.07.2021 |
| Rajula Srivastava | University of Wisconsin, Madison | 20.07.2021 – 14.08.2021 |
| Terence Tao | Department of Mathematics, UCLA | 02.07.2021 – 14.07.2021 |
| Niclas Technau | University of Madison-Wisconsin | 20.07.2021 – 14.08.2021 |
| Lola Thompson | Universiteit Utrecht | 03.05.2021 – 29.05.2021 |
