Lucy Hawking is a coauthor of George's Secret Key to the Universe and the author of two adult novels. She is a journalist who has written for British newspapers and an administrative staff member of the Autism Research Centre at the University of Cambridge. She has one son. Stephen Hawking is a coauthor of George's Secret Key to the Universe. He is the Lucasian Professor of Mathematics at the University of Cambridge. He is widely regarded as one of the most brilliant theoretical physicists since Einstein. His adult book A Brief History of Time sold more than 12 million copies worldwide.