21. JIM SIMONS

$21.6  SELF-MADE SCORE: *

BILLION SOURCE: HEDGE FUNDS AGE: 81 RESIDENCE: EAST SETAUKET, NY PHILANTHROPY SCORE: The wealthiest hedge fund manager on the planet is the founder of Renaissance Technologies, an esteemed quantitative trading firm that manages $68 billion. A big chunk of that belongs to Simons and other Renaissance insiders. A code breaker for the U.S. during the Vietnam War and a former math teacher, Simons founded Renaissance in 1982 and retired in 2010, but remains involved as chairman.