| Anders Claesson | Reykjavik University | 2009–2010, 2002 |
| Sergey Kitaev | Reykjavik University | 2009–2010 |
| Bridget Eileen Tenner | DePaul University | 2010 |
| Mark Dukes | University of Iceland | 2010 |
| Lauren K. Williams | Harvard University | 2007 |
| Mireille Bousquet-Mélou | LaBRI, Université Bordeaux 1 | 2005 |
| Petter Brändén | Stockholm University | 2002 |
| Richard Ehrenborg | University of Kentucky | 2000, 1998, 1996 |
| Eric Babson | University of California, Davis | 2000 |
| Margaret Readdy | University of Kentucky | 1998 |
| Jon Lee | IBM Research | 1997 |
| Chun Wa Ko | 1997 | |
| Robert J. Clarke | The University of Adelaide | 1997 |
| Jiang Zeng | Université Claude Bernard Lyon-I | 1997 |