Occupation: CEO, Zynga
Pincus never wants you to work again. Or at least that's how it seems, considering how addictive Zynga's roster of games is. Every day, 60 million people log in to play Zynga titles such as Farmville and Words with Friends. Pincus has profited handsomely: in 2011 he made Forbes' World's Billionaires list, with an estimated net worth of $1.8 billion. His latest power move: acquiring the makers of the wildly popular mobile game Draw Something for $180 million just weeks after its launch.