Stephen Hawking was the Lucasian Professor of Mathematics at the University of Cambridge for thirty years, and has been the recipient of numerous awards and honors including, most recently, the Presidential Medal of Freedom. His books for the general reader include the classic A Brief History of Time, Black Holes and Baby Universes and Other Essays, The Universe in a Nutshell, and A Briefer History of Time. He lives in Cambridge, England.Leonard Mlodinow received his doctorate in theoretical physics from the University of California at Berkeley, and teaches at Caltech. He is the New York Times bestselling author of The Drunkard's Walk: How Randomness Rules our Lives, Subliminal: How Your Unconscious Mind Rules Your Behavior, War of the Worldviews: Science versus Spirituality (with Deepak Chopra), Feynman's Rainbow: A Search for Beauty in Physics and in Life, and Euclid's Window: The Story of Geometry from Parallel Lines to Hyperspace. He also wrote for Star Trek: The Next Generation. He lives in South Pasadena, California.