Financier
Age: 71
He's one of Wall Street's richest -- and most feared -- financiers. And while his recent bids to take over the boards of Motorola and Time Warner (Business 2.0 and CNNMoney.com's parent company) failed, Icahn made a ton of money for fellow shareholders in the process of trying. When Icahn's not taking on titans of business, he's helping out startups: Earlier this year, Icahn invested $50 million in Motricity, a North Carolina-based provider of mobile media-delivery technology. Age: 71
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