| Name | Affiliation | period |
| Francesco Amoroso | Université de Caen Basse-Normandie |
1 May 2005
- 30 May 2005 |
| Alan Baker | University of Cambridge |
4 July 2005
- 12 July 2005 |
| Francesco Baldassarri | Università di Padova |
13 April 2005
- 16 April 2005 |
| Michael Bennett | University of British Columbia |
22 May 2005
- 29 May 2005 |
| Massimo Bertolini | Universita' Statale di Milano |
9 May 2005
- 13 May 2005 |
| Daniel Bertrand | Université Pierre et Marie Curie |
20 July 2005
- 23 July 2005 |
| Yuri Bilu | Université de Bordeaux I |
1 April 2005
- 31 July 2005 13 June 2005 - 8 July 2005 |
| Fedor Bogomolov | Courant Institute, New York University |
1 May 2005
- 31 May 2005 |
| Paula B. Cohen | Texas A&M University |
7 May 2005
- 14 May 2005 |
| Jean-Louis Colliot-Thélène | CNRS - Université Paris-Sud |
16 May 2005
- 22 May 2005 |
| Pietro Corvaja | Università di Udine |
18 April 2005
- 29 April 2005 16 May 2005 - 26 May 2005 20 June 2005 - 24 June 2005 3 July 2005 - 7 July 2005 |
| Sinnou David | Université Pierre et Marie Curie |
13 June 2005
- 18 June 2005 |
| Roberto Dvornicich | Università di Pisa | |
| Jan-Hendrik Evertse | Universiteit Leiden |
23 May 2005
- 18 June 2005 |
| Gerd Faltings | MPI für Mathematik |
12 April 2005
- 27 April 2005 |
| Carlo Gasbarri | Université de Strasbourg |
23 May 2005
- 29 May 2005 |
| Andrew Granville | University of Montreal |
26 June 2005
- 2 July 2005 |
| Philipp Habegger | Johann Wolfgang Goethe-Universität, Frankfurt am Main |
4 July 2005
- 15 July 2005 |
| Roger Heath-Brown | Oxford University |
17 April 2005
- 29 April 2005 |
| Marc Hindry | Université Paris 7 Denis Diderot |
19 June 2005
- 25 June 2005 |
| Michel Laurent | Institut de Mathématiques de Luminy |
23 May 2005
- 30 May 2005 |
| David Masser | Universität Basel |
2 July 2004
- 31 July 2004 1 April 2005 - 31 July 2005 |
| Loïc Merel | Université de Paris VII |
17 April 2005
- 24 April 2005 |
| Maurice Mignotte | Université Louis Pasteur, Strasbourg |
19 June 2005
- 25 June 2005 |
| Junjiro Noguchi | University of Tokyo |
10 June 2005
- 18 June 2005 |
| Patrice Philippon | Institut de Mathématiques de Jussieu, CNRS |
15 May 2005
- 22 May 2005 |
| Richard Pink | ETH Zurich, Switzerland |
5 July 2005
- 7 July 2005 |
| Gaël Rémond | Institut Fourier, Grenoble |
11 July 2005
- 18 July 2005 |
| Andrzej Schinzel | Institute of Mathematics,Polish Academy of Sciences |
25 April 2005
- 2 May 2005 |
| Hans Peter Schlickewei | Philipps-Universität Marburg |
18 July 2005
- 21 July 2005 |
| Wolfgang Schmidt | University of Colorado at Boulder |
26 May 2005
- 17 June 2005 |
| Joseph Silverman | Mathematics Department, Brown University |
19 June 2005
- 25 June 2005 |
| Alexei Skorobogatov | Imperial College London |
3 July 2005
- 8 July 2005 |
| Peter Swinnerton-Dyer | Cambridge University |
15 May 2005
- 22 May 2005 |
| Lucien Szpiro | The CUNY Graduate Center |
1 April 2005
- 31 July 2005 6 June 2005 - 7 July 2005 |
| Rob Tijdeman | Universiteit Leiden |
11 June 2005
- 18 June 2005 |
| Yuri Tschinkel | Courant Institute, NYU and University of Goettingen |
6 May 2005
- 11 May 2005 |
| Thomas Tucker | University of Rochester |
6 July 2005
- 14 July 2005 |
| Emmanuel Ullmo | Université Paris Sud |
23 April 2005
|
| Evelina Viada | Universität Goettingen/ ETH Zurich |
10 July 2005
- 13 July 2005 |
| Carlo Viola | Dipartimento di Matematica "L.Tonelli", Università di Pisa | |
| Paul Vojta | University of California, Berkeley |
25 May 2005
- 15 June 2005 |
| Michel Waldschmidt | Faculté de Mathématiques, Université Pierre et Marie Curie |
24 May 2005
- 1 June 2005 |
| Gisbert Wüstholz | ETH, Zürich |
24 April 2005
- 8 May 2005 |
| Yuri Zarhin | Pennsylvania State University |
15 May 2005
- 24 May 2005 |
| Shou-Wu Zhang | Columbia University |
16 April 2005
- 30 April 2005 |