PAUL D. SPUDIS is an active lunar scientist based in Houston, Texas. He received his education at Arizona State University (B.S., 1976; Ph. D., 1982) and at Brown University (Sc.M., 1977). His research focuses on the processes of impact and volcanism on the planets and studies of the requirements for sustainable human presence on the Moon. He was Deputy Leader of the Science Team for the Department of Defense Clementine mission to the Moon in 1994, the Principal Investigator of the Mini-SAR imaging radar experiment on India’s Chandrayaan-1 mission in 2008-2009, and a team member of the Mini-RF imaging radar on NASA’s Lunar Reconnaissance Orbiter mission (2009-present). He was a member of the White House Synthesis Group in 1990-1991, the President’s Commission on the Implementation of U. S. Space Exploration Policy in 2004 and was presented with the NASA Distinguished Public Service Medal that same year. He is the recipient of the 2006 Von Karman Lectureship in Astronautics, (awarded by the American Institute for Aeronautics and Astronautics), a 2011 Space Pioneer Award (from the National Space Society) and the 2016 Columbia Medal (from the American Society of Civil Engineers). He is the author or co-author of over 120 scientific papers and seven books, including The Once and Future Moon (1994), a book for the general public in the Smithsonian Library of the Solar System series, and (with Ben Bussey) The Clementine Atlas of the Moon (2004; Second Edition 2012), published by Cambridge University Press, and The Value of the Moon (2016), a history of lunar return efforts published by the Smithsonian Press.