STEPHEN MANDEL JR.

$2.8

BILLION  SELF-MADE SCORE: & SOURCE: HEDGE FUNDS AGE: 63 RESIDENCE: GREENWICH, CT PHILANTHROPY SCORE: In January, Mandel stepped down from overseeing investments at Lone Pine Capital, the hedge fund firm he founded in 1997. Despite losing money last year, he is considered one of his generation’s best hedge fund investors.