STEPHEN HAWKING held the position of Lucasian Professor of Mathematics at the University of Cambridge for thirty years. He is the author of A Brief History of Time which was an international bestseller. His other books for the general reader include A Briefer History of Time, the essay collection Black Holes and Baby Universe and The Universe in a Nutshell.
Physicist LEONARD MLODINOW has taught at Cal Tech, written for Star Trek: The Next Generation, and is the author of Euclid's Window, Feynman's Rainbow and Some Time with Feynman.