1. Departments of Pediatrics and Medicine, Tufts University School of Medicine and the New England Medical Center Hospitals (Boston Floating Hospital).
2. Tufts University School of Medicine and Pediatric Hematologist, New England Medical Center Hospitals.
3. Blood Research Laboratories, New England Medical Center Hospitals.
4. Tufts University School of Medicine and Hematologist, New England Medical Center Hospitals.
5. Tufts University School of Medicine and Chief Hematologist, Blood Research Laboratories, New England Medical Center Hospitals. Currently Professor of Medicine, Mount Sinai Medical School, New York.