| Captain, MC, USAF, Chief, Research Services Division, Aerospace Medical Laboratory (Clinical), Lackland A.F.B., San Antonio, TX | 1964-1966 |
| Instructor in Surgery, Stanford University, Stanford, CA | 1966-1967 |
| Assistant Professor of Surgery, Stanford University | 1967-1971 |
| Associate Professor of Surgery, Stanford University | 1972-1973 |
| Associate Professor of Cardiac Surgery, Stanford University | 1973 - 1998 |
| Chief and Surgeon, Cardiovascular Surgery Department, Palo Alto Veterans Administration Hospital | 1975-1976 |
| Examiner, State of California Board of Medical Quality Assurance | 1975-1976 |
| Vice-President, A-1 Ambulance Service, Inc., Salinas, California | 1977-Present |
| Technical Advisor and bit - part actor, "Transplant", Time - Life TV Movie of the Week | 1978 |
| Member, State Bar of California | 1981-Present |
| Admitted to the Bar of the California Supreme Court | 1981 |
| Admitted to the Bar of the Federal District Court for the Northern District of California. | 1981 |
| Consultant, Medical Malpractice Litigation, Scientific Fraud, and Ambulance Litigation | 1981-Present |
| Admitted to the Bar of the Federal District Court for the Eastern District of California. | 1990 |
| Counselor, District Committee on Constitutional Matters, California- Hawaii-Nevada District, Lutheran Church - Missouri Synod | 1991-1997 |
| Admitted to the Bar of the United States Supreme Court | Sep. 1997 |
| Associate Professor of Cardiac Surgery, Emeritus, Stanford University | 1998-Present |