- Intern, St. Radboud Hospital, Nijmegen, The Netherlands, 1969-1971;resident in department medicine, U. Nijmegen (The Netherlands), 1971-1975;instructor medicine, New York Hospital, Cornell Univercity, New York City, 1975-1977;research associate, Cardiovascular Center, New York Hospital, Cornell Univercity, New York City, 1975-1977;internist, Department Medicine, St. Radboud Hospital, Nijmegen, The Netherlands, 1977-1980;associate professor medicine, University of California, Irvine, 1980-1985;associate chief, VA Medical Center, Long Beach, California, 1980-1985;director clinical research, Boehringer Ingelheim Pharmaceutical, Inc., Ridgefield, Connecticut, 1985-1988;vice president marketing support, G. H. Besselaar Associations, Princeton, New Jerseysenior vice president, G.M. Besselaar Associations, Princeton, New Jersey, 1990-1995;executive vice president gene therapy development, Somatix Therapy Corporation, Alameda, California, 1995-1996;consultant in drug development strategies, since 1997. Cons, National Institutes of Health Special Study Section, 1984, American College Chest Physicians, Section on Hypertension, 1985.
Fellow American College Clinical Pharmacology, Council for High Blood Pressure Research, American College Chest Physicians, American College Cardiology. Member International Society Hypertension, American Society for Clinical Pharmacology and Therapeutics (nominating committee 1988, co-chair Chicago Mercantile Exchange committee 1985, chair Chicago Mercantile Exchange committee since 1992), International Society Chronobiology, American Geriatrics Society, American Society Hypertension (charter), American Federation for Clinical Research.