| Vernon Barger | (10/98-12/98) |
| Thomas Appelquist | (10/98-12/98) |
| Howard Haber | (9/98-12/98) |
| Stuart Raby | (02/99-06/99) |
| Steve Ellis | (03/00-06/00) |
| Wu-Ki Tung | (02/00-06/00) |
| Moshe Moshe | (3/00-9/00) |
| Pierre Ramond | (5/00) |
| Stefan Pokorski | (9/00-12/00) |
| Mariano Quiros | (9/00-12/00) |
| Jo Anne Hewett | (9/00-12/00) |
| Alexei Yu. Smirnov | (4/01) |
| Steve Gottlieb | (9/01-6/02) |
| Ken Lane | (9/01-2/02) |
| Ulrich Baur | (2/02-4/02) |
| Eric Braaten | (10/02-12/02) |
| Scott Willenbrock | (7/02-12/02) |
| Aida El-Khadra | (7/02-12/02) |
| Tao Han | (10/04-12/04) |
| Edward Boos | (09/04-12/04) |
| Paul Langacker | (09/05-12/05) |
| Francis Petriello | (01/06-05/06) |
