Postdoctoral fellow Oak Ridge (Tennessee) National Laboratory, 1987-1988. Analytical development chemist Merrell Dow Pharmaceutical Company, Cincinnati, 1988-1990. From senior research chemist to senior associate scientist Marion Merrell Dow Research Institute, 1990-1992.
Manager Fijisawa United States of America, Inc., Chicago, 1992-1995, associate director, since 1995. Adjunct professor Rush Medical College, Chicago, 1992-1996. Analytical chemistry consultant Martin Marietta Energy System, Oak Ridge, 1986-1987.