John D. Barrow is Professor of Mathematical Sciences and Director of the Millennium Mathematics Project at Cambridge University, Gresham Professor of Astronomy and a Fellow of the Royal Society. He is the author of many highly acclaimed books about modern developments in physics, astronomy, and mathematics, including <i>The Left Hand of Creation, The Anthropic Cosmological Principle, Theories of Everything: The Quest for Ultimate Explanation, Pi in the Sky: Counting, Thinking, and Being, Impossibility: the limits of science and the science of limits, Between Inner Space and Outer Space, The Origin of the Universe, The Universe that Discovered Itself, The Book of Nothing, The Constants of Nature: from alpha to omega</i> and, most recently, <i>The Artful Universe Expanded</i> and <i>The Infinite Book: a short guide to the boundless, timeless and endless</i>. He is also the author of the award-winning play <i>Infinities</i>.