Intern Conemaugh Valley Memorial, Johnstown, Pennsylvania, 1973-1974. Resident family practice McNeal Hospital, Berwyn, Illinois, 1974. Resident family practice, occupational medicine Cook County Hospital, Chicago, 1975-1976, director health hazard evaluation, 1977-1978.
Director programs in medicine, occupational medicine residency University Illinois College Medicine, 1978-1982, associate professor occupational medicine, 1982-1988. Vice president Carnow, Conibear & Associates, 1977-1988, president, since 1988. Epidemiologist Argonne National Laboratory, Lemont, Illinois, 1979-1981.
Chief medical officer Milwaukee ready reckoner, Chicago, 1982-1986. Consultant to Department Energy, Washington, 1986-1993. President Athena Analytical Laboratory, Inc., 1992-1998.
Appointed to National Advisory Committee on Occupational Safety and Health, 1994.