Intern University Illinois Research and Educational Hospital, Chicago, 1966-1967. Pediatric resident Cleveland Metropolitan Hospital, 1967-1970. Major Ireland Army Hospital, Fort Knox, Kentucky, 1970-1972.
Neurology resident Johns Hopkins Hospital, Baltimore, 1972-1975. Assistant professor Johns Hospkins University School Medicine, 1975-1981, associate professor, 1981-1988, professor department neurology and pediatrics, since 1988, Haller professor pediatric neurology, since 1997. Member medical board Greater Washington Tourette Syndrome Association, Incontinentia Pigmentia Association.
Member editorial board Movement Disorders Pediatric Neurology.