WILLIAM BERKLEY

$2.6

BILLION  SELF-MADE SCORE: 8 SOURCE: INSURANCE AGE: 73 RESIDENCE: COCONUT GROVE, FL PHILANTHROPY SCORE: Berkley is chairman of W.R. Berkley, an insurance company that he founded with $2,500 as an M.B.A. student. Shares of the insurer rose more than a third in the past year, returning him to The Forbes 400 for the first time since 1992.