JOHN ARNOLD

$3.3

BILLION  SELF-MADE SCORE: * SOURCE: HEDGE FUNDS AGE: 45 RESIDENCE: HOUSTON PHILANTHROPY SCORE: Arnold got his start trading sports cards, reportedly traveling around Texas and neighboring states to buy cards and resell them, and shipping cards to Canada for resale at higher prices. He went through college in three years and later made a fortune trading natural gas for Enron before it imploded. Over the past decade Arnold, who only invests his own money now, has bet on such big energy projects as natural gas storage caverns, solar farms and deepwater drilling in the Gulf of Mexico.