1. American National Red Cross Research Laboratories; Department of Pathology, New York University School of Medicine; Department of Medicine, George Washington University School of Medicine; and Department of Pediatrics, Cornell University Medical College.
2. Senior Research Associate, American National Red Cross Research Laboratories, Eastern Division, and Associate Professor of Pathology, New York University School of Medicine, New York, N. Y.
3. Research Director, American National Red Cross Blood Program, and Assistant Clinical Professor of Medicine, George Washington University School of Medicine, Washington, D. C.
4. Cornell University Medical College, and Attending Pediatrician, Department of Pediatrics, New york Hospital, New York, N. Y.