1. Assistant in Anesthesia, Massachusetts General Hospital; Instructor of Anesthesia, Harvard Medical School
2. Research Assistant
3. Research Fellow in Anesthesia and Pharmacology, Massachusetts General Hospital and Harvard Medical School
4. Edward Mallinckrodt Jr. Professor of Pharmacology in Anesthesia, Departments of Anesthesia and of Biological Chemistry and Molecular Pharmacology, Massachusetts General Hospital and Harvard Medical School