| Jan Uwe | Ness | Arizona State University | 2008-06-02 | 2008-06-04 |
| Margherita | Grossi | Max Planck Institute (Garching) | 2008-05-29 | 2008-06-03 |
| Elena Maria | Rossi | University of Colorado at Boulder (USA) | 2008-05-19 | 2008-05-24 |
| Andreas | Schmitt | Vienna Institute of Technology (Austria) | 2008-05-08 | 2008-05-11 |
| Pavlos | Protopapas | Harvard University (USA) | 2008-05-05 | 2008-05-09 |
| Mercedes | López-Morales | Carnegie Institution of Washington (USA) | 2008-04-27 | 2008-05-01 |
| Marc | Balcells | Instituto de Astrofísica de Canarias (IAC) | 2008-04-21 | 2008-04-25 |
| Stefania | Pandolfi | Università di Roma La Sapienza | 2008-02-15 | 2008-04-15 |
| Jeff | Wagg | NRAO, Socorro | 2008-04-07 | 2008-04-11 |
| Kazuharu | Bamba | Kinki University (Osaka, Japan) | 2008-03-05 | 2008-03-16 |
| Sinichi | Nojiri | Nagoya University, Japan | 2008-03-10 | 2008-03-16 |
| Aram | Saharian | Yereban State University | 2008-02-21 | 2008-03-14 |
| Iver | Brevik | Universidad de Trondheim | 2008-03-03 | 2008-03-06 |
| Enrique | Garcia-Melendo | Observatori Esteve Duran | 2008-03-05 | 2008-03-06 |
| Misao | Sasaki | Yukawa Institute (Kyoto) | 2008-02-23 | 2008-02-29 |
| Gabriel | Franco | Instituto de Ciencias Exatas, Universidade Federal de Minas Gerais | 2008-01-15 | 2008-02-29 |
| Nanda | Rea | SRON/Univ. Amsterdam | 2008-02-20 | 2008-02-21 |
| Andrei | Makarenko | TSPU (Tomsk) | 2008-02-06 | 2008-02-20 |
| Petr | Tretyakov | BLTP (Dubna) | 2008-02-06 | 2008-02-20 |
| Zachory | Berta | Harvard University | 2007-11-05 | 2008-02-04 |
