1. Postdoctoral Fellow, Division of Immunology, Stanford University School of Medicine, supported by a senior fellowship of the American Cancer Society, California Division
2. Division of Immunology, Department of Medicine, Stanford University School of Medicine, Stanford, California and the Kaiser‐Permanente Medical Center, Walnut Creek, California.
3. Attending Physician, Kaiser‐Permanente Medical Center
4. Senior Technologist, MLC Typing Laboratory, Division of Immunology, Stanford University School of Medicine
5. Research Director, Walnut Creek Contraceptive Drug Study
6. Professor of Medicine, Stanford University School of Medicine.