1. Instructor in Anaesthesia, Anesthesia Services, Massachusetts General Hospital, and Department of Anaesthesia, Harvard Medical School.
2. Assistant Professor of Anesthesia, Anesthesia Services, Massachusetts General Hospital, and Department of Anaesthesia, Harvard Medical School.
3. Chief, Molecular Neurobiology Laboratory, Addiction Research Center/NIDA; Associate Professor of Neurology and Neuroscience, Departments of Neurology and Neuroscience, Johns Hopkins School of Medicine.