the International Institute for Applied Systems Analysis in Austria; and a member of faculty at Imperial College, London, where he is visiting professor. Dr. Beck received his B.Sc. in chemical engineering from the University of Exeter and his Ph.D. in control engineering from the University of Cambridge.

Clayton J. Clark II is an assistant professor of civil and coastal engineering at the University of Florida. His research interests include implementing waste management procedures; delineating and remediation of contaminated hazardous waste sites; and combining chemical and environmental engineering techniques for hazardous waste handling, disposal, and treatment from both soil and aqueous systems. Dr. Clark is also associated with the Florida Center for Solid and Hazardous Waste Management through his work on the modeling of the fate and transport of contaminants from pressure-treated wood. Dr. Clark received his B.S. from Florida A&M University and his Ph.D. from the University of Florida.

Robert T. Clemen is an associate professor of decision sciences at the Fuqua School of Business, Duke University. Before going to Duke, Dr. Clemen was associate professor at the University of Oregon and senior researcher at Decision Research in Eugene, Oregon. His teaching and research interests focus on decision analysis, especially the use of models and expert judgment for decision making. He received his B.A. from Stanford University, M.B.A. from the University of Colorado, and Ph.D. from Indiana University.

Judith A. Graham is the managing director of the American Chemistry Council’s (ACC) long-range research initiative (LRI). The LRI sponsors research to advance the science of risk assessment for the health impacts of chemicals to support decision making by government, industry, and the public. Her research interests include inhalation toxicology, exposure analysis, and health effects and health risks of air pollutants. Before joining ACC, Dr. Graham was associate director for health at EPA’s National Exposure Research Laboratory (NERL). She has served on several previous National Research Council study committees. Dr. Graham received her Ph.D. in physiology and pharmacology from Duke University.

Louis J. Gross is the director of the Institute for Environmental Modeling, a professor of ecology and evolutionary biology, and a professor of

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