Dr. Teresa Bowers is past President of Gradient, an environmental and risk science consulting firm in Cambridge, Massachusetts. She has more than 30 years of experience in exposure modeling, mathematical and geochemical modeling, and the application of this information to risk-based environmental strategies and development of site-specific cleanup levels. Her areas of expertise include modeling of blood lead and urine arsenic levels resulting from exposure to environmental sources of lead and arsenic. She is the author of an adult blood lead model now being used by the Environmental Protection Agency, and she has worked on a number of sediment sites involving PCB contamination, where she developed unique statistical approaches to calculating soil cleanup levels. She is frequently invited to speak on these topics by both industry and government groups. Prior to joining Gradient, Dr. Bowers held research and visiting faculty positions at the Massachusetts Institute of Technology and Harvard University. She holds a B.S. degree in mathematics and geology from Purdue University, and a Ph.D. degree in geochemistry from the University of California, Berkeley.