He earned his BS from the University of the State of New York, Albany; his MA in astronomy and informatics; and his doctorate in education from George Mason University. Dr. Geller has been teaching physics and astronomy for over a quarter century. He has been the Associate Chair of the Department of Physics and Astronomy; manager of Washington Operations for the Consortium for International Earth Science Information Networks; program manager at Science Applications International Corporation; and, doctoral fellow of the State Council of Higher Education for Virginia. He has authored or edited 7 books, and has published about 85 papers in education, astrobiology, astrophysics, and biochemistry. His current scholarly interests include energy and the environment; the search for life in the universe; and the exploration of space.