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Adam Grant, 29
Associate Professor of Management
School: Univ. of Pennsylvania Wharton

"He's this incredible teacher, always pushing the class discussion forward, challenging people to go further, but with a sure, subtle, delicate hand that makes you feel not only challenged and encouraged to go further, but also feel so fundamentally safe doing so," says Zach Miller, a current MBA student.

NEXT: Stijn Van Nieuwerburgh, 34
Last updated February 17 2011: 12:20 PM ET
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