president of the Council of the Cooper Ornithological Society, a 30-year member of the Ecological Society of America, and a trustee of the Colorado Nature Conservancy.

Thomas Dietz is professor of sociology and environmental science and public policy at George Mason University. He received a PhD in Ecology from the University of California, Davis in 1979 and a bachelor's degree in general studies from Kent State University in 1972. He is past president of the Society for Human Ecology, a fellow of the American Association for the Advancement of Science, a Danforth Fellow (Class of 1972), and the 1997 recipient of the Distinguished Contribution Award by the American Sociological Association's Section on Environment, Science and Technology; he has been a Fellow at the Swedish Collegium for Advanced Study in the Social Sciences. He has been coeditor or coauthor of The Handbook for Environmental Planning (Wiley, 1972), The Risk Professionals (Russell Sage Foundation, 1987), Human Ecology: Crossing Boundaries (Society for Human Ecology, 1993), Environmentally Significant Consumption: Research Directions (National Academy Press, 1997), and over 60 refereed papers and book chapters. His current research interests include environmental values and valuation, human driving forces of environmental change, and cultural dynamics. He has served on the National Research Council's Committee on Human Dimensions of Global Change.

Perry R. Hagenstein has been an independent consultant on natural-resources economics and policy since 1976 in Wayland, MA. He is president of the Institute for Forest Analysis, Planning, and Policy, a nonprofit research and education organization, and chairman of the Board of Trustees of the New England Natural Resources Center, a nonprofit trust that works with other organizations on interstate natural-resources issues in New England. He was research forester, Fordyce Lumber Company, Arkansas; principal economist, Northeastern Forest Experiment Station, USDA Forest Service; senior policy analyst, US Public Land Law Review Commission; research fellow, Harvard University; and executive director, New England Natural Resources Center. He has served on numerous committees and boards of the National Research Council that concern natural resources and is now a member of four such committees. He is a former president and long-time board member of American Forests, the nation's oldest national citizens conservation organization.

Anthony J. Krzysik is senior research ecologist at US Army Construction Engineering Research Laboratories. He received a BS in chemistry from Carnegie Mellon University, and an MS in physical chemistry and a PhD in biology-ecology from the University of Pittsburgh. His research focuses on practical applications of quantitative and theoretical ecology to a broad range of natural-resource management problems. His current research includes statistical sam-



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