1. Blood Research Laboratory, Pratt Clinic-New England Center Hospital, and the Department of Medicine, Tufts University School of Medicine, Boston, Mass.
2. Blood Research Laboratory, New England Center Hopital, (U.S.P.H.S. Fellowship #HPD-8986); Assistant in Medicine, Tufts University School of Medicine, Boston, Mass.
3. Blood Research Laboratory, New England Center Hospital; Assistant Professor of Medicine, Tufts University Medical School, Boston, Mass.
4. Blood Research Laboratory, New England Center Hospital, Boston, Mass. (Work done under tenure of Leukemia Foundation Fellowship.)
5. Tufts University School of Medicine; Director, Blood Research Laboratory, New England Center Hospital, Boston, Mass.