General Counsel, United States Department of Agriculture, 2002-2005. Partner, Environment and Natural Resources Group, Crowell & Moring, LLP, 1988-2002. Assistant Chief, Environmental Defense Section, U.S. Department of Justice, 1982-1984. Trial Attorney, U.S. Department of Justice, 1979-1982. Member, Appellate Litigation Section, Solicitor's Office, Occupational Safety and Health Administration, 1975-1979. Member, USDA Advisory Committee on Biotechnology, 2006-2008. Md. Master Gardener, Montgomery County.