05/30/2012 04:42 pm ET

Dennis Kelleher, Lawyer Skilled At Scandal Cleanup, Presses for Tougher Banking Rules

Sitting in a corner office high above K Street here, Dennis M. Kelleher, one of the most powerful lobbyists on financial regulatory reform, looks every bit the corporate lawyer and high-ranking Senate aide he formerly was: tailored suit, quick smile, assertive tone.

But Mr. Kelleher does not work for banks. He works against them.

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