Cochair, Bill & Melinda Gates Foundation
The world’s second-richest man is worth $65 billion—and that’s after giving away more than $28 billion. Gates’ post-Microsoft mission includes eliminating many infectious and deadly diseases: By his own estimates, that could translate into 8 million lives saved by 2020. But the quintessential activist billionaire doesn’t stop there: Gates continues to persuade his peers to sign the “Giving Pledge,” promising to give away half their wealth or more.
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