- 1938[subject unknown]Independent
- 1939[subject unknown]Independent
- 1939[subject unknown]Independent
- 1940[subject unknown]Independent
- 1941[subject unknown]Independent Investigators
- 1942[subject unknown]Independent
- 1943[subject unknown]Independent
- 1973[subject unknown]Corporation Member
- 1974[subject unknown]Corporation Member
- 1975[subject unknown]Corporation Member
- 1976[subject unknown]Corporation Member