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Timothy Geithner to join the private equity firm Warburg Pincus

(Brendan Smialowski / AFP/Getty Images)

Former Treasury secretary, who led U.S. response to the financial crisis, will advise firm on strategy, investing.

Tim Geithner is cashing in

(Chip Somodevilla / Bloomberg News)

Should you care that the former Treasury secretary is going into the private equity business? It depends on what his role at Warburg Pincus will really be.