Ruth S. DeFries (born October 20, 1956) is an environmental geographer who specializes in the use of remote sensing to study Earth's habitability under the influence of human activities, such as deforestation, that influence regulating biophysical and biogeochemical processes. She was one of 24 recipients of the 2007 MacArthur Fellowship, and was elected to the United States National Academy of Sciences in 2006. DeFries received her Ph.D. in 1980 from the Department of Geography and Environmental Engineering at Johns Hopkins University and her B.A. in Earth Science in 1976 from Washington University in St. Louis. In April 2016, Columbia University named her a University Professor, its highest academic rank. She had previously been the Denning Family Professor of Sustainable Development in Columbia's Department of Ecology, Evolution, and Environmental Biology. Before moving to Columbia in 2008, she was a professor at the University of Maryland, College Park with joint appointments in the Department of Geography and the Earth System Science Interdisciplinary Center. More information...
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