- 1994[position unknown]
- 1958[position unknown]
- 1938Research Chemist
- 1939Research Chemist
- 1949Research Chemist
- 1953Research Chemist
- 1958Independent Investigator
- 1958Research Director Emeritus
- 1931Director
- 1932Director Of Research
- 1934Director Of Research
- 1935Director Of Research
- 1937Director Of Research
- 1938Director Of Research
- 1939Director Of Research
- 1945Director Of Research
- 1948Research Director Emeritus
- 1949Research Director Emeritus
- 1953Research Director Emeritus
- 1956Research Director Emeritus
- 1957Research Director Emeritus
- 1958[position unknown]
- 1992[position unknown]
- 1934Research Assistant
- 1935Research Physical Chemist
- 1938Research Chemist
- 1939Research Chemist
- 1944Research Biological Chemistry
- 1958[position unknown]
- 1953[position unknown]
- 1931[position unknown]
- 1934Research Assistant
- 1935Research Chemist
- 1937[position unknown]
- 1938[position unknown]
- 1939[position unknown]
- 1940[position unknown]
- 1941[position unknown]
- 1942[position unknown]
- 1943[position unknown]