- 1972Research Fellow
- 1971Henry Isaiah Dorr Professor And Anesthetist-In-Chief
- 1972Henry Isaiah Dorr Professor Of Anesthesia And Anesthetist-In-Chief
- 1972Instructor In Medicine
- 1967[position unknown]
- 1977Mallinckrodt Professor Of Medicine And Chief Of Gastrointestinal Unit
- 1966[position unknown]
- 1966Associate Professor Of Dermatology And Medicine
- 1973Mallinckrodt Professor Of Medicine And Chief Of Gastronintestinal Unit
- 1974Mallinckrodt Professor Of Medicine And Chief Of Gastronintestinal Unit
- 1978Mallinckrodt Professor Of Medicine And Chief Of The Gastrointestingal Unit