John D. Barrow is Professor of Mathematical Sciences and Director of the Millennium Mathematics Project at Cambridge University, Fellow of Clare Hall, Cambridge, a Fellow of the Royal Society, and the current Gresham Professor of Geometry at Gresham College, London. His principal area of scientific research is cosmology, and he is the author of many highly acclaimed books about the nature and significance of modern developments in physics, astronomy, and mathematics, including The Origin of the Universe; The Universe that Discovered Itself; The Book of Nothing; The Constants of Nature; The Infinite Book: a Short Guide to the Boundless, Timeless and Endless, The Artful Universe Expanded, and New Theories of Everything, and 100 Essential Things You Didn't Know You Didn't Know. He is also the author of the award-winning play Infinities.