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Gregg Polle

said he is leaving the company, where he oversees the investment banking unit that advises and raises money for industrials companies.

Polle, a former head of mergers and acquisitions who spent 25 years at the firm, is the latest Citigroup investment banking veteran to leave , following in the footsteps of M&A chief Frank Yeary and

Michael Klein

, chairman of Citi's institutional clients group.

"After 25 great years I just felt I was getting a bit stale and it was time to try something else," Polle told