Ally Financial Inc. said it has tapped outsider Barbara Yastine as its new chief administrative officer, a role created as the company — until Monday called GMAC Inc. — announced its chief risk officer, Samuel Ramsey, decided to resign.

Yastine will be responsible for the risk, compliance, legal and technology functions at the lender.

She was most recently a principal at Southgate Alternative Investments, and has worked for Credit Suisse First Boston and Citigroup Inc.

Yastine's appointment is effective immediately. Ally said Ramsey decided to resign for personal reasons on Friday and will remain in his post until the end of the month. After that, Ramsey will be an adviser on "key strategic initiatives."

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