31. Tony Hsieh & Charles Best (tie)

Hsieh: CEO,
Age: 38 
Industry: Apparel

Hsieh still runs Zappos, but he's attained guru status when it comes to building workplaces: His "Delivering happiness" message is now the basis for a bestselling book and a company that exports his philosophy to giants like P&G and Hasbro. 

Latest move: Investing in private jet outfit JetSuite. 

Best: Founder,
Age: 36 
Industry: Nonprofit

Donations for Best's nonprofit, which raises funds for public school classrooms, are on track for $40 million this school year, nearly double from two years ago, and now total $90 million since 2000. Last year his gift card was among Oprah's "ultimate favorite things." 

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