25. Ray dalio
$18.1 billion Self-made Score: * Source: hedge Funds age: 69 reSidence: greenWich, ct PhilanthroPy score: The founder of the world’s biggest hedge fund firm is trying to make sure his Bridgewater Associates and its $160 billion in assets under management outlive him. In June, Dalio announced he was turning Bridgewater into a partnership to allow top employees to gain stakes in the firm and have a say in how it’s run. He launched Bridgewater from his New York City apartment in 1975 after earning an M.B.A. from Harvard. Dalio published a new book in September; the simply named Big Debt Crises focuses on investing in tumultuous times. He has given nearly $770 million to his foundation, which has backed efforts to protect the world’s oceans and funded medical institutions.