to control biological processes. She is a registered professional engineer in the State of Colorado. She is a member of the American Society of Civil Engineers, International Association for Water Pollution Research Control, American Water Works Asso-ciation, Water Pollution Control Federation, American Society for Microbiology, Association of Environmental Engineering Professors, and the Society of Women Engineers.

Sarah Clark Stuart is a program officer with the Pew Charitable Trusts in Philadelphia and is a private environmental consultant. She earned her B.A. in botany with an emphasis on plant ecology from Pomona College and her M.F.S. from the Yale School of Forestry and Environmental Studies with an emphasis in soil and water science. She was Staff Scientist and Co-Program Head for the Environmental Defense Fund's Eastern Water Program where she was involved with research, writing and advocacy on local and national coastal water pollution issues, including sewage sludge management, wastewater treatment, contaminated sediments, and ocean disposal and dredge material.

Paul E. Waggoner is Distinguished Scientist and former Director of the Connecticut Agricultural Experiment Station in New Haven. He earned his S.B. from the University of Chicago, and his M.S. and Ph.D. from Iowa State University. Dr. Waggoner's research interests include agriculture, plant pathology, and the effect of the environment on plants, especially plant diseases. He chaired a Council for Agricultural Science and Technology Task Force on Preparing U.S. Agriculture for Global Climate Change. He has been a member of several National Research Council committees, and chaired a subpanel of the Committee on Policy Implications for Greenhouse Warming. Dr. Waggoner is a member of the National Academy of Sciences, American Meteorology Society, American Society of Agronomy, and American Phytopathological Society.