2002-2009 Parametrix, Inc.
2002-Present Oregon State University Department of Environmental and Molecular Toxicology, Courtesy
1998-2002 Colorado State University Department of Environmental Health, Affiliate Faculty
1990-2002 Colorado State University Department of Fisheries and Wildlife Biology, Affiliate Faculty
1987-2002 ENSR Consulting and Engineering
1985-1987 Mobay Corporation; Health, Environment, and Safety Division
1983-1985 University of Wyoming, Fish Physiology and Toxicology Laboratory
1979-1983 Exxon Corporation, Research and Environmental Health Division