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. Source: Wikipedia (en)