April 11 (Reuters) - Mark Shafir, one of Citigroup Inc's (C.N) top dealmakers, is retiring after a career spanning over three decades during which he advised some of the world's largest corporations on several landmark deals. Shafir, who has led Citi's global mergers and acquisitions unit since joining the bank in 2008, will stay on till mid-May to help with the transition, according to an internal memo sent on Tuesday by Tyler Dickson and Manuel Falco, Citi's global co-heads of banking, capital Markets and advisory. Cary Kochman, who has served as co-head of global M&A at Citi alongside Shafir since 2017, will continue to lead the franchise. "(Mark) has been one of the lead drivers of our M&A business and has played a central role developing the franchise, which grew significantly under his leadership," Dickson and Falco said in the memo. Shafir was instrumental in shaping Citi's M&A franchise during his tenure and advised on several landmark transactions.

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