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Dana White

UFC president

Lacking any kind of filter -- what with his Twitter wars, foul language and long list of enemies -- White is not your conventional exec. The 43-year-old is, however, president, kingmaker, promoter and authoritarian ruler of the Ultimate Fighting Championship, a fast-growing, privately held sport valued around $2 billion. And if you don't like it, you can go to hell, you %#*$.

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