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Hannes Hofmann , the global head of Citigroup Inc.’s family office unit, is leaving about three years after his arrival, the latest in a series of leadership changes for the Wall Street giant’s wealth business. Hofmann recently informed fellow executive Dawn Nordberg , Citi’s head of integrated client engagement, of his decision to leave the New York-based firm, according to an internal memo seen by Bloomberg News. The JPMorgan Chase & Co. veteran, who worked in Citigroup’s private bank, will continue to work closely with Nordberg’s team over the next few weeks to ensure a smooth transition, the memo said.