| Year | Position | Institution |
| 1974 | Associate Professor | University Of Maryland 4 |
| 1975 | Associate Professor | University Of Maryland 4 |
| 1976 | Associate Professor Of Biology | University Of Maryland 4 |
| 1977 | Associate Professor | University Of Maryland 4 |
| 1978 | University Of Maryland 5 | |
| 1979 | University Of Maryland | |
| 1980 | University Of Maryland | |
| 1981 | University Of Maryland | |
| 1982 | University Of Maryland | |
| 1983 | University Of Maryland | |
| 1984 | University Of Maryland | |
| 1985 | University Of Maryland | |
| 1986 | University Of Maryland | |
| 1987 | W 4 | |
| 1987 | L Cohen 4 | |
| 1987 | University Of Maryland | |
| 1988 | University Of Maryland | |
| 1989 | University Of Maryland | |
| 1990 | University Of Maryland 5 | |
| 1991 | University Of Maryland | |
| 1992 | University Of Maryland | |
| 1993 | National Science Foundation | |
| 1994 | National Science Foundation | |
| 1995 | National Science Foundation | |
| 1996 | National Science Foundation | |
| 1997 | National Science Foundation | |
| 1998 | National Science Foundation | |
| 1999 | National Science Foundation | |
| 2000 | National Science Foundation |
| Year | Subject | Role |
| 1974 | Independent | |
| 1975 | Independent | |
| 1976 | Library Readers | |
| 1977 | Independent | |
| 1978 | Library Readers | |
| 1987 | Other Research Personnel | |
| 1990 | Other Research Personnel |
| Year | Location |
| 1978 | college park |
| Year | Start Date | End Date | Subject | Role |
| 1978 | - | - | Corporation Member | |
| 1979 | - | - | Corporation Member | |
| 1980 | - | - | Corporation Member | |
| 1981 | - | - | Corporation Member | |
| 1982 | - | - | Corporation Member | |
| 1983 | - | - | Corporation Member | |
| 1984 | - | - | Corporation Member | |
| 1985 | - | - | Corporation Member | |
| 1986 | - | - | Corporation Member | |
| 1987 | - | - | Corporation Member | |
| 1988 | - | - | Corporation Member | |
| 1989 | - | - | Corporation Member | |
| 1990 | - | - | Corporation Member | |
| 1991 | - | - | Corporation Member | |
| 1992 | - | - | Corporation Member | |
| 1993 | - | - | Corporation Member | |
| 1994 | - | - | Corporation Member | |
| 1995 | - | - | Corporation Member | |
| 1996 | - | - | Corporation Member | |
| 1997 | - | - | Corporation Member | |
| 1998 | - | - | Corporation Member | |
| 1999 | - | - | Corporation Member | |
| 2000 | - | - | Corporation Member |