| November 2019 - May 2020 | Thomas Farrell | (State University of New York at Binghamton) |
| October 2017 - December 2017 | Huihong Jiang | (Shanghai Jiao Tong University) |
| October 2015 - December 2015 | David González Álvaro | (Universidad Autónoma de Madrid) |
| April 2015 - June 2015 | Anand Dessai | (Université de Fribourg) |
| October 2014 - December 2014 | David González Álvaro | (Universidad Autónoma de Madrid) |
| October 2014 | Jesús Núñez-Zimbrón | (Universidad Nacional Autónoma de México) |
| July 2014 | Anton Petrunin | (Pennsylvania State University) |
| April 2014 - March 2015 | Masoumeh Zarei | (Tarbiat Modares University) |
| 2013/2014 | Stephan Klaus | (Mathematisches Forschungszentrum Oberwolfach) |
