(Reuters) -Andy O'Brien, the global head of loan capital strategy at JPMorgan Chase ( JPM ), is set to retire at the end of 2025 after 40 years at the largest U.S. lender, according to an internal memo seen by Reuters on Tuesday.

In his current role, O'Brien has been responsible for overseeing the lending portfolio across JPMorgan's ( JPM ) global corporate and investment banking businesses.

Over the years, O'Brien has held various leadership roles within JPMorgan ( JPM ), including as the global co-head of debt capital markets.

"Andy has been pivotal in developing our world-leading debt franchise over the span of his remarkable career," Bregje de Best and James Roddy, co-heads of global corporate banking at J.P. Morgan said in the memo.

Throughout his time at JPMorgan ( JPM ), O'Brien led several high-profile financings, including the $61 billion bridge loan to finance Verizon's 2013 acquisition of Vodafone's wireless unit.

During the 2008 global financial crisis, O'Brien helped the U.S. government structure its rescue financing of insurer AIG.