JOHN D. BARROW is a cosmologist, theoretical physicist, and mathematician. He is a professor of mathematical science at the University of Cambridge and Director of the Millennium Mathematics Project. He is also a professor of geometry at Gresham College.

He is the author of several books including: *Pi in the Sky*, *The Origin of the Universe *(Science Masters Series),*The Artful Universe*, *The Constants of Nature: From Alpha to Omega—the Numbers That Encode the Deepest Secrets of the Universe, *and *The Book of Universes.*