Lonnie G. Thompson (NAS) is a professor at the Ohio State University’s School of Earth Sciences and senior research scientist at the Byrd Polar Research Center. His research focuses on searching glacial ice for clues to global warming, and he uses new technologies in the emerging science of paleoclimatology. Dr. Thompson made his first expedition to glaciers in December 1973 to Antarctica and he has been on more than 50 glaciological research expeditions since then. Dr. Thompson pioneered studies of Quaternary climate change recorded in low-latitude alpine icecaps. His work on ice cores led to a fundamental shift in thinking about the importance of the tropics in global climate change. He was elected to the advisory board of the International Glaciological Society in 1999. Dr. Thompson was elected a fellow of the American Geophysical Union in 2001, was named a 2002 Distinguished University Professor from the Ohio State University, and elected to the National Academy of Sciences in 2005. He received the National Medal of Science in 2007.

James L. Wescoat, Jr., is an Aga Khan Professor at the Massachusetts Institute of Technology. His research concentrates on water systems in South Asia and the United States from the site to river basin scales. He has served on the Water Science and Technology Board, including Committees for the Review of Lake Ontario-St. Lawrence Studies; Downstream: Adaptive Management of Glen Canyon Dam and the Colorado River; and A New Era for Irrigation. He has contributed to studies of climate, water, and food security in the Indus Basin; and to historical research on waterworks of the Mughal period in India and Pakistan. In 2003, he coauthored Water for Life: Water Management and Environmental Policy with geographer Gilbert F. White. Dr. Wescoat received his Ph.D. in geography from the University of Chicago.

Mark W. Williams is a professor of geography and fellow of the Institute of Arctic and Alpine Research at the University of Colorado, Boulder. Dr. Williams’ research interest is the processes that determine the hydrology, hydrochemistry, and biogeochemistry of high-elevation basins, including the storage and release of solutes from the snowpack, biogeochemical modifications of snowpack runoff, nutrient cycling, surface-groundwater interactions, and hydrological pathways and residence time. Current projects include the Rocky Mountains, Andes, European Alps, Central Asian areas of Kazakhstan and Kirghizia, western China including Tibet, and the Himalayas. Dr. Williams was elected a fellow of the American Geophysical Union in 2012 and is a former Fulbright Research Scholar. He received his Ph.D. in biological sciences with an emphasis in ecology and hydrology from the University of California, Santa Barbara in 1991.

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