- 1960[subject unknown]Research Assistants
- 1961[subject unknown]Research Assistants
- 1962[subject unknown]Research Assistants
- 1964[subject unknown]Independent
- 1965[subject unknown]Independent
- 1966[subject unknown]Independent
- 1967[subject unknown]Independent
- 1968[subject unknown]Independent
- 1969[subject unknown]Independent
- 1970[subject unknown]Independent
- 1971[subject unknown]Independent
- 1966[subject unknown]Corporation Member
- 1967[subject unknown]Corporation Member