Ramin Talaie/Bloomberg News

James "Jamie" Dimon

Mortgage Lender
What he does: chairman, president, and CEO, JPMorgan Chase
In position since: 2006
Why he is powerful: Dimon, who is also on the board of directors of the New York Federal Reserve, has been called the country’s most important banker. His leadership during the financial crisis helped the company quickly repay its bailout to the federal government, earning him a spot on "Bloomberg BusinessWeek’s list of inspirational leaders in 2009". Dimon has been vocal in the debate on financial regulation.

(This caption has been updated.)

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