| Year | Position | Institution |
| 1975 | Associate Investigator | Instituto Venezolano De Investigaciones 4 |
| 1978 | Assistant Investigator | Centro De Biofisica Y Bioquimica 4 |
| 1979 | Instituto Venezolano De Investigaciones Cientificas 4 | |
| 1980 | University Of Maryland School Of Medicine 4 | |
| 1982 | University Of Maryland School Of Medicine 4 | |
| 1984 | Idea 4 | |
| 1985 | Idea 4 | |
| 1986 | Idea 4 | |
| 1987 | Instituto Internacional De Estudios Avanzados 4 |
| Year | Subject | Role |
| 1975 | Grass Fellows | |
| 1978 | Independent | |
| 1979 | Other Research Personnel | |
| 1980 | Other Research Personnel | |
| 1982 | Other Research Personnel | |
| 1984 | Other Research Personnel | |
| 1985 | Other Research Personnel | |
| 1986 | Other Research Personnel | |
| 1987 | Other Research Personnel |
| Year | Location |
| 1975 | venezuela |
| 1978 | caracas, venezuela |
| 1979 | venezuela |
| 1985 | venezuela |
| 1986 | venezuela |
| 1987 | venezuela |