J. JOE RICKETTS & FAMILY

$2.6

BILLION  SELF-MADE SCORE: ) SOURCE: TD AMERITRADE AGE: 78 RESIDENCE: LITTLE JACKSON HOLE, WY PHILANTHROPY SCORE: He took nine years to graduate from Creighton University, dropping out at times to save money for tuition. He helped pay his way by working as a dorm-room janitor. Ricketts founded a stock brokerage in 1975 that grew into Ameritrade.