KEITH DEVLIN, mathematician, is a senior researcher at Stanford University, and executive director of Stanford's H-STAR institute (Human-Sciences and Technologies Advanced Research institute); President and Chief Scientist at the educational technology company BrainQuake, Inc. He is the author of *Goodbye, Descartes: The End of Logic and the Search for a New Cosmology of the Mind; Life by the Numbers*; *The Language of Mathematics: Making the Invisible Visible*; *Mathematics*, *InfoSense*, *The Math Gene*, *The Millennium Problems*, and* The Unfinished Game.*

His latest books are *The Man of Numbers: Fibonacci’s Arithmetic Revolution;* *Leo and Steve: The Young Genius Who Beat Apple to Market by 800 Years* (e-book original); and *Mathematics Education for a New Era: Video Games as a Medium for Learning*.