Interdisciplinary Programs in Health fellow Harvard School Public Health, Boston, 1982-1984. Research fellow Children's Hospital Research Foundation, Cincinnati, 1984-1987. Research instructor department pediatrics U.Cin., 1986-1988, research assistant professor, 1988-1993.
Assistant professor environmental health science University of California at Los Angeles School Public Health and Center Occup. and Environmental Health, 1993-1995, associate professor, since 1995. Visiting scientist Freie University Berlin, 1989-1990. Member biology faculty Raymond Walters College, University Cincinnati, 1992-1993, Environmental Science and Engineering Program, since 1994, Center Environmental Risk Reduction, since 1996.