| Year | Position | Institution |
| 1989 | Los Alamos National Laboratory 4 | |
| 1990 | University Of Houston 4 | |
| 1992 | University Of Houston 4 | |
| 1996 | University Of Houston 4 | |
| 1997 | Bristol Myers Squibb Pri 4 | |
| 1998 | Bristol Myers Squibb 4 | |
| 1999 | Bristol Myers Squibb Pri 4 |
| Year | Role | Course |
| 1989 | Lecturer | Molecular Evolution 1989 |
| 1990 | Faculty | Molecular Evolution 1990 |
| 1992 | Faculty | Molecular Evolution 1992 |
| 1996 | Director | Workshop On Molecular Evolution 1996 |
| 1997 | Director | Workshop On Molecular Evolution 1997 |
| 1998 | Director | Workshop On Molecular Evolution 1998 |
| 1999 | Director | Workshop On Molecular Evolution 1999 |