Chairman and CEO, News Corp. (NWS)
Age: 76
His 2005 purchase of MySpace for $580 million was widely mocked -- until traffic surged and Google inked a $1 billion advertising deal with the social networking giant. Now Murdoch is trying to buy Dow Jones, publisher of the Wall Street Journal, for $5 billion. A foolish play for print? Betting on Murdoch's next move is risky business. But betting on his long-term success usually pays off. Age: 76
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