and industrial chemicals, in aquatic systems and wildlife populations. He studies accumulation by and effects of these classes of compounds on fish, birds, and mammals, considering the biochemical mechanism of action and population, community, and ecosystem-level effects. Dr. Giesy received his Ph.D. in limnology from Michigan State University. He has recently served on the NRC Committee on Risk-Based Criteria for Non-RCRA Hazardous Waste and the Committee on Remediation of PCB-Contaminated Sediments.

JOSEPH B. HUGHES is an associate professor and chair of the Department of Environmental Engineering at Rice University. Professor Hughes’ research focuses on the ability of bacteria and plants to metabolize hazardous organic chemicals. In particular, his work addresses metabolic pathways and their control, interactions of physiochemical processes and biodegradation processes, and how to modify and enrich metabolic processes in situ. He has chaired numerous conference sessions dedicated to contaminant bioavailability, bioremediation, and natural attenuation and is a principal investigator of contaminant bioavailability in the anaerobic subsurface. Dr. Hughes received his B.A. in chemistry from Cornell College and his M.S. and Ph.D. in civil and environmental engineering from the University of Iowa.

SAMUEL N. LUOMA is a senior research hydrologist in the Water Resources Division of the U.S. Geological Survey, where he has worked since 1976. Dr. Luoma’s research centers on sediment processes, both natural and human-induced, particularly in the San Francisco Bay area. Since 1992, he has published extensively on the bioavailability of metals to aquatic organisms, with emphasis on sediments. He has also helped refine approaches to determine the toxicity of marine and estuarine sediments. In 1999, he was invited to discuss how chemical speciation influences metal bioavailability in sediments for the European Science Foundation. He has served multiple times on the EPA’s Science Advisory Board Subcommittee on Sediment Quality Criteria. Dr. Luoma received his M.S. in zoology from Montana State University, Bozeman, and his Ph.D. in marine biology from the University of Hawaii, Honolulu.

LINDA A. MALONE is the Marshall-Wythe Foundation Professor of Law at the College of William and Mary, where she has worked since 1988. Prior to that she taught law at the University of Arkansas School of Law. During her career, she has clerked for Judge Wilbur F. Pell, U.S. Court of Appeals for the Seventh Circuit, and practiced law at Alston, Miller & Gaines in Atlanta and at Ross, Hardies, O’Keefe, Babcock & Parsons in Chicago. Ms. Malone is the author of numerous publications, including a treatise called Environmental Regulation of Land Use, and a casebook, Environmental Law. She was also the associate editor of the Yearbook of International Environmental Law and a member of the Advisory Board of the National Enforcement Training Institute of EPA. She received

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