Citigroup hired Petros Sabatacakis to be senior risk officer and a member of the banking company's management committee, reporting to co-chairmen and co-chief executives Sanford I. Weill and John S. Reed, said a person familiar with the situation.

Mr. Sabatacakis, a former banker at Chemical Banking Corp. with experience in global treasury, commercial banking, and capital markets, joins Citigroup from American International Group Inc. in New York, where he was most recently senior vice president for financial services.

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