Resident preventive medicine Walter Reed Army Institute of Research, Washington, 1969-1971, chief epidemiology, 1973-1976, United States Army Medical Research Unit, Bangkok, Thailand, 1971-1973, commander Thailand, 1977-1980. Chief professional services Winn Army Community Hospital, Fort Stewart, Georgia, 1980-1983. Commander Moncrief Army Community Hospital, Fort Jackson, South Carolina, 1983-1986, Martin Army Community Hospital, Fort Benning, Georgia, 1987-1990.
Central medical director Keystone Peer Review Organization, Harrisburg, Pennsylvania, 1990-1994. Professor Pennsylvania State University Hershey School Medicine, 1991-1994. Executive vice president CHP-The Medical Group, New Hyde Park, New York, 1994-1995.
Medical director Elderplan, Brooklyn, since 1996. Adjunct professor University of Southern California Schools of Medicine and Public Health, Columbia, South Carolina, 1983-1986.