1. Blood Research Laboratory, New England Medical Center Hospitals, and the Department of Medicine, Tufts University School of Medicine, Boston, Mass.
2. American Heart AssociatiOn;Assistant Hematologist, Boston Floating Hospital, New England Medical Center HospitaLs; Instructor in Medicine, Tufts University School of Medicine, Boston, Mass.
3. New England Medical Center HospitaLs, and Professor of Medicine, Tufts University School of Medicine, Boston, Mass., presently, Attending Hematologist, The Mt. Sinai Hospital, and Professor of Medicine,The Mt. Sinai School of Medicine, New York, N. Y.