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    Founder and CEO
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Tanaka presides over a world of opal-eyed digital zombies and pirates. GREE, the mobile social-gaming company he founded in his apartment in 2004, has become Japan’s biggest social network — of any kind. Globally it reportedly has 190 million users and expects to generate $2.5 billion in revenue this year. To gain a foothold in the West, GREE acquired U.S. mobile-game maker OpenFeint last year. The company’s success has turned the boyish Tanaka into Asia’s youngest self-made billionaire. Tanaka says he grew up obsessively playing NES games into the twilight hours. His parents thought he was wasting his time, he says. Clearly they were wrong. –Matt Vella