| Joaquin | Prieto Brito | | 2006-02-14 | 2006-06-01 |
| Martin | Letzinger | Institute of Physics / IGAM | 2006-07-11 | 2006-07-14 |
| Petra | Odert | Institute os Physics / IGAM | 2006-07-11 | 2006-07-14 |
| Vittoria | Finazzi | | 2006-01-23 | 2006-07-23 |
| Laust | Olsen | University of Aalborg (Denmark) | 2006-02-07 | 2006-07-31 |
| Maria Laura | Ceccarelli | Universidad Nacional de Córdoba | 2006-05-01 | 2006-08-31 |
| Fabio | Briscese | Universitat de Roma | 2006-10-05 | 2006-11-30 |
| Mario | Nadalini | Trento University | 2006-12-08 | 2006-12-15 |
| Hector Martin | Croce | New York University | 2006-08-28 | 2007-03-30 |
| Abilio | Mateus | | 2006-10-06 | 2007-04-30 |
| Basil | Sa'd | Franckfurt Institute for Advanced Studies, Germany | 2007-09-10 | 2007-09-14 |
| Craig | Hogan | Univ. of Seattle, USA | 2007-10-29 | 2007-10-31 |
| Sergio | Zerbini | Universitá degli Studi di Trento | 2007-11-07 | 2007-11-09 |
| Guido | Cognola | Università degli Studi di Trento | 2007-11-07 | 2007-11-09 |
| Mauricio | Martínez | Frankfurt University | 2007-11-13 | 2007-11-16 |
| Mike | Strickland | Frankfurt University | 2007-11-13 | 2007-11-16 |
| Raúl | Angulo | Institute for Computational Cosmology - Durham | 2007-11-26 | 2007-11-30 |
| Mariafelicia | de Laurentis | Universitá di Napoli | 2007-11-26 | 2007-11-30 |
| Salvatore | Capozziello | Universitá di Napoli | 2007-11-26 | 2007-11-30 |
| Peter | Lavrov | Tomsk State Pedagogical University | 2007-11-26 | 2007-11-30 |
