tions within the Ethiopian government, including director of National Museums and coordinator of the Paleoanthropology Laboratory of the National Museum of Ethiopia. He has a bachelor’s degree in geology from Addis Ababa University and a Ph.D. from the University of California at Berkeley.

Gail M. Ashley is professor of geological sciences and director of the Quaternary Studies Graduate Program at Rutgers University, New Jersey. Her research interests include a comparison of terrestrial records of paleoclimate during the Quaternary in polar, temperate, and tropical regions, and reconstruction of the paleoenvironment of early hominids. She is currently president of the American Geological Institute and has served as president of the Geological Society of America, vice president of the International Association of Sedimentologists, editor-in-chief of the Journal of Sedimentary Research, and president of the Society for Sedimentary Geology. Dr. Ashley received B.S. and M.S. degrees in geology from the University of Massachusetts and a Ph.D. in geology from the University of British Columbia.

Thure E. Cerling (NAS) is Distinguished Professor of Geology and Geophysics and Distinguished Professor of Biology at the University of Utah. His research focuses on near-surface processes and the geological record of ecological change, particularly using geochemical proxies to understand the physiology and paleodiets of mammals, using soils as indicators of climatological and ecological change over geological timescales, and landscape evolution over the past several million years. Dr. Cerling has served on several NRC committees, including the Board on Earth Sciences and Resources (BESR), the U.S. Geodynamics Committee, and the U.S. National Committee for the International Union for Quaternary Research. He is a member of the U.S. Nuclear Waste Technical Review Board. Dr. Cerling is a fellow of the American Association for the Advancement of Science and the Geological Society of America. He received B.A. and M.S. degrees in geology from Iowa State University and his Ph.D. in geology from the University of California at Berkeley.

Andrew S. Cohen is a professor of geosciences and a professor of ecology and evolutionary biology at the University of Arizona. Dr. Cohen’s research focuses on the depositional environments, paleoecology, and climate history of the African rift lakes and the arid climate lakes of the western United States. He has a major project investigating the history of human impacts from watershed deforestation around Lake Tanganyika on the lake’s benthic ecosystem. He earned his Ph.D. from the University of California. Dr. Cohen is a member of the Board of Directors of DOSECC (Drilling, Observation and Sampling of the Earth’s Continental Crust) the U.S. consortium for support of continental scientific drilling, and is also on the Scientific Advisory Board of the International Continental Scientific Drilling Program.

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