Computer science professor, Stanford University
Age: 45
Fifteen years ago, Motwani was on a team that upended centuries of mathematical tradition (with the discovery of a short way to check long proofs). But he's better known as a mentor to his most famous students, Larry Page and Sergey Brin. Off campus, he's continuing his career as an angel investor by helping pick startups for this year's TechCrunch20 conference. Age: 45
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