land-use change in semiarid regions. Her group is working in the southwestern United States, India, and China and collaborating with groups in West Africa and Australia. Her research focuses on evaluation of the effects of land-use change on groundwater resources; quantification of groundwater recharge on the basis of soil physics, environmental tracers, and numerical simulations; assessment of paleoclimate effects on groundwater recharge in semiarid and arid regions; and evaluation of groundwater contamination related to geogenic and anthropogenic sources. Dr. Scanlon has participated in focus groups on global recharge in the International Atomic Energy Agency and has served on National Research Council committees on radioactive-waste disposal and integrated observations in the hydrologic sciences. Dr. Scanlon received a B.S. in geology from Trinity College, Dublin (Ireland), an M.S. from the University of Alabama, and a Ph.D. from the University of Kentucky.

NATIONAL RESEARCH COUNCIL STAFF

MARK D. LANGE (Study Director) is a program officer with the National Research Council’s Board on Earth Sciences and Resources and director of the Geographical Sciences Committee. He is a geomorphologist and has expertise in river and coastal processes, Geographic Information Systems, and science policy. He was a Tyler Environmental Fellow and a U.S. Congressional Fellow where he managed federal environment and natural resources policy for a member of Congress. He is a member of the Association of American Geographers and the American Geophysical Union and holds a Ph.D. and graduate certificate in geographic information sciences from the University of Southern California.

PEGGY TSAI is a program officer with the National Research Council’s Board on Agriculture and Natural Resources. She joined the National Research Council in 2004 and has worked on various studies ranging from agricultural biotechnology to animal health to international agriculture. She began her work with the National Academies as a Christine Mirzayan Science and Technology Policy Fellow. Ms. Tsai received an M.A. in science, technology, and public policy from George Washington University and a B.S. in microbiology and molecular genetics with a double major in political science from the University of California, Los Angeles.

NICHOLAS D. ROGERS is a financial and research associate with the Board on Earth Sciences and Resources, National Research Council. He received a B.A. in history, with a focus on the history of science and early American history, from Western Connecticut State University in 2004. He began working for the National



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