Sergey Brin, Google

Brin, 40, is the second Google executive on this list, behind Page, with an estimated net worth of $31.8 billion, right behind Bezos at No. 19 on the overall billionaire's list.

Though Page runs the Mountain View, Calif.-based Google, Brin is perhaps deserving of more of the credit for putting Google in the spotlight. Brin heads up the company's X Labs division, which has worked on such projects as Google Glass and driverless cars, among other projects.

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