Dr. Keith Devlin is Executive Director of Stanford's Center for the Study of Language and Information and a Consulting Professor of Mathematics at Stanford. He is a co-founder of Stanford’s Media X network – a campuswide research network focused on the design and use of interactive technologies – and its Executive Director. He is the author of twenty-four books, one interactive book on CD-ROM and over seventy-five published research articles. Since 1994 Devlin has been a regular contributor to NPR’s "Weekend Edition," where he is known as "the Math Guy" in his on-air conversations with host Scott Simon. Devlin is a frequent contributor to other local and national radio programs. Devlin was a co-writer of the BBC Horizon/WGBH Nova television documentary "A Mathematical Mystery Tour" and has appeared on a number of television programs, including the six-part PBS series "Life by the Numbers," for which he wrote the companion book.