Robert Geroch is Professor of Physics at the University of Chicago. He received his Ph.D. at Princeton University, and has held positions at the University of London, Syracuse University, and the University of Texas. He is the author of General Relativity From A to B.
Roger Penrose is Emeritus Rouse Ball Professor of Mathematics at Oxford University. He is the author of a number of books, including The Emperor's New Mind, The Nature of Space and Time (with Stephen Hawking), and The Road to Reality.
David C. Cassidy is a Professor in the Natural Science Program at Hofstra University. He served as Associate Editor of The Collected Papers of Albert Einstein, and is the author of Einstein and Our World, Uncertainty: The Life and Science of Werner Heisenberg, and J. Robert Oppenheimer and the American Century.
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