Ian Stewart is the author of the successful Professor Stewart's Hoard of Mathematical Treasures and Professor Stewart's Cabinet of Mathematical Curiosities. Emeritus Professor of Mathematics at the University of Warwick and Emeritus Professor of Gresham College, London, he is also a regular research visitor at the Mathematical Biosciences Institute, Ohio State University. His writing has appeared in New Scientist, Discover, Scientific American, and many newspapers in the U.K. and U.S. He lives in Warwick, England.