Mathematician Keith Devlin is Executive Director Emeritus of the Human-Sciences and Technologies Advanced Research Institute (H-STAR) at Stanford University and The Math Guy on NPR's Weekend Edition.

Keith writes the Devlin’s Angle blog posts. Read the complete Devlin’s Angle archive.

His website is, and he also blogs at

Follow him on Twitter: @profkeithdevlin.

His most recent books are Introduction to Mathematical Thinking (Amazon original), Mathematics Education for a New Era: Video Games as a Medium for Learning (AK Peters/CRC Press), The Man of Numbers: Fibonacci's Arithmetic Revolution (Walker & Co), and a short Leonardo and Steve: The Young Genius Who Beat Apple to Market by 800 Years (Amazon original).

Contact Keith by email.

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