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.

He takes over the senior risk officer function from William R. Rhodes, who was appointed vice chairman of the company in March and who now oversees client relationships in emerging markets.

The hiring comes as Citigroup shuffles other key executive positions, the source said. Thomas Trainer, who joined the company's operations and technology group in April, has been named chief information officer for Citigroup, a new position.

Mr. Trainer had been reporting to Mary Alice Taylor, an executive vice president in charge of Citi's global operations and technology functions. But company insiders and observers of the bank said a recent decision by Mr. Reed and Mr. Weill to split their duties and relegate management of the centralized operations functions back to major business lines diluted Ms. Taylor's power. The source confirmed a report in the Wall Street Journal that Ms. Taylor has decided to leave the bank.

Before joining Citigroup, Mr. Trainer was chief information officer at Eli Lilly & Co., an Indianapolis-based pharmaceutical company. -- Liz Moyer

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