1. Instructor in Preventive Medicine and Clinical Epidemiology, the Channing Laboratory, Harvard Medical School and Brigham and Women's Hospital.
2. Associate Professor of Medicine, the Channing Laboratory, Harvard Medical School and Brigham and Women's Hospital.
3. Research Associate in Medicine (Epidemiology), the Channing Laboratory, Harvard Medical School and Brigham and Women's Hospital.
4. Associate Professor of Preventive Medicine and Clinical Epidemiology, the Channing Laboratory, Harvard Medical School and Brigham and Women's Hospital.
5. Associate Professor of Medicine and Community and Family Medicine, Dartmouth Medical School.
6. Professor and Chief, Epidemiology and Biostatistics, Boston University School of Public Health.