Dr. Clarke is a research cartographer and professor, with an M.A. and Ph. D. from the University of Michigan, specializing in Analytical Cartography. His most recent research has been on environmental simulation modeling, modeling urban growth using cellular automata, terrain mapping and analysis, and on real-time visualization. He is the author of three textbooks in eight editions, and over a hundred and fifty book chapters, journal articles, and papers in the fields of cartography, remote sensing, and geographic information systems. Chair of the National Academy of Sciences Mapping Sciences Committee from 2004-2010, Dr. Clarke recently chaired National Research Council studies on the National Map and on the National Geospatial-Intelligence Agency and served on the USGS Geography Discipline long-term science planning team, for which he received the USGS's John Wesley Powell Award in 2005. He currently serves on the Board on Earth Sciences and Resources for the National Academies, and on the National Geographic Society’s Committee on Research and Exploration.