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Callahan Gets A Larger Role At Citi?

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We hear that Citigroup is poised to name Don Callahan, another newcomer to Citi, as its chief operating administrative officer sometime this morning. The longtime Morgan Stanley marketing executive and a former IBM executive is said to be one of Vikram Pandit's closest advisers. Callahan joined Citi this fall, and has been operating chief of its investment bank and alternative investment group. Citigroup could not be reached for comment this morning.