Former Assistant Administrator, U.S. Environmental Protection Agency (EPA), Office of Prevention, Pesticides and Toxic Substances (OPPTS), 2000-2001. Former Associate Assistant Administrator, OPPTS, 1993-2000. Senior Professional Staff Member, U.S. House of Representatives, Government Operations Committee, Subcommittee on Environment, Energy and National Resources, 1991-1993. Director of Policy Development, Wallace Institute for Alternative Agriculture, 1990-1991. Policy expert on FIFRA and TSCA, U.S. Library of Congress, Congressional Research Service, 1983-1990. Professional Staff Member, U.S. Senate Committee on Government Affairs, Subcommittee on Energy, 1981-1983.