| Year | Position | Institution |
| 1968 | Duke University 4 | |
| 1969 | Duke University 4 | |
| 1970 | Duke University 4 | |
| 1972 | Professor | Universidad Central De Venezuela 4 |
| Year | Subject | Role |
| 1968 | Research Assistants | |
| 1969 | Research Assistants | |
| 1970 | Research Assistants | |
| 1972 | Independent |