metals in aquatic and soil environments. He has authored more than 170 journal papers, book chapters, and major reports and has edited seven books and prepared numerous reports and proceedings papers. He has been the principal or co-principal investigator for over 70 research projects funded by government and industry. His principal areas of research are the fate of metals in aquatic and terrestrial environments and the development of site-specific criteria. He headed a multiuniversity consortium of universities, supported by the Environmental Protection Agency from 1994 until 2000 that conducted research on the fate and effects of metals and organics in natural water systems, and now heads the newly formed multiuniversity EPA Center for the Study of Metals in the Environment. Dr. Allen was a member of the organizing committee for the 1993 EPA Annapolis workshop and a member of the 1996 SETAC Pellston conference to review water quality criteria for metals. He served as chairman of the Organizing Committee for the Workshop on Metal Speciation that was held in Jekyll Island, Georgia, every two years from 1987 through 1995. He has also served as a consultant to a number of industrial companies, government agencies, and the World Health Organization.


Jean M. Bahr is a professor of hydrogeology in the Department of Geology and Geophysics, University of Wisconsin-Madison, where she has been a faculty member since 1987. She is a former chair of the Water Resources Management Program at UW and a member of the Geological Engineering Program faculty. Her research interests include both naturally occurring and anthropogenic sources of groundwater contamination and the coupled physical and biogeochemical processes responsible for subsurface contaminant transport. She is currently serving a three-year term on the Council of the Geological Society of America and in 2003 was the Geological Society of America’s Hydrogeology Division Birdsall-Dreiss Distinguished Lecturer. She earned a B.A. in geology from Yale University and M.S. and Ph.D. degrees in applied earth sciences (hydrogeology) from Stanford University.


Philip C. Bennett is a professor in the Department of Geological Sciences at the University of Texas, Austin. He teaches undergraduate and graduate courses in aqueous geochemistry and hydrology and graduate courses in geomicrobiology, organic geochemistry, and geochemical kinetics. His research is primarily in the area of microbial and environmental geochemistry, mineral weathering kinetics, and geomicrobiology, with a focus on the influence of geochemistry and geology on subsurface microbial ecology. Dr. Bennett has a B.S. from Evergreen State College (Olympia, WA), a M.S. from SUNY Syracuse, and a Ph.D. from Syracuse University.



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