nia, Berkeley. His research interests concern the behavior, ecology, conservation, and management of large mammals. Dr. McCullough has served on four NAS/NRC committees reviewing wildlife issues, most recently as Principal Investigator on the study Brucellosis in the Greater Yellowstone Area.

Barbara H.Allen-Diaz is Professor of Environmental Science, Policy, and Management at the University of California, Berkeley. She received her A.B. in anthropology, M.S. in range management, and Ph.D. in wildland resource science from the University of California, Berkeley. Her research interests include plant community succession and classification, meadow, hardwood rangeland ecology, forest grazing, hydrology, and range management.

Norman F.Cheville is Dean of the College of Veterinary Medicine at Iowa State University. He received a D.V.M. from Iowa State University and M.S. and Ph.D. from the University of Wisconsin. In 1968, he served a sabbatical year at the National Institute for Medical Research, London, studying under Anthony Allison. The honorary degree Doctor Honoris Causa was conferred by the University of Liége in 1986 for outstanding work in veterinary pathology. Dr. Cheville served as Principal Investigator on the NRC study Brucellosis in the Greater Yellowstone Area.

Russell W.Graham is Chief Curator at the Denver Museum of Nature and Science. He received his Ph.D. from the University of Texas at Austin. His research interests include the evolution and biogeography of Quaternary mammal communities. He currently serves on the NRC’s U.S. National Committee for the International Union for Quaternary Research and the National Committee for DIVERSITAS.

John E.Gross is Senior Research Scientist with the Division of Sustainable Ecosystems, Commonwealth Scientific and Industrial Research Organisation, Australia, and Research Associate with the Natural Resource Ecology Laboratory, Colorado State University. He earned his B.A. from the University of Colorado in biology, M.S. in zoology from Colorado State University, and Ph.D. in ecology from the University of California, Davis. Dr. Gross’s research interests include conservation biology, ecological modeling, and the population and nutritional ecology of herbivores.

James A.MacMahon is Trustee Professor of Biology at Utah State University. He earned his B.S. in zoology at Michigan State University and Ph.D. in



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