Age: 48
Occupation: U.S. Secretary of the Treasury
Previous TIME 100 Appearances: 1
Geithner's list of results for 2009 includes saving two failing U.S. automakers, selling off U.S. stakes in major financial companies, limiting bonuses for Wall Street executives and negotiating complicated financial regulatory reform bills with the House and Senate. His biggest job is also his hardest, trying to frame policies that can reduce stubbornly high joblessness in America.