Sir Gerry Grimstone is to step down as chairman of Barclays' investment banking arm.
The lender said he will relinquish the role by the end of February.
Sir Gerry said: "After 20 years sitting on the boards of a number of listed companies, and having recently stepped down from the chairmanship of Standard Life Aberdeen, it is an appropriate moment for a change.
"Going forward, I will be concentrating on my public sector activities in the UK, my work with Deloitte in Europe and globally, my work in the Gulf, India, China and elsewhere in Asia-Pacific."
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He said: "There will doubtless be many other exciting public and private opportunities to pursue."
"I'm leaving Barclays in very good shape and I wish it very well for the future."
Sub-prime lender Non-Standard Finance has announced a £1.3 billion all-share takeover of its rival Provident.
NSF boss John van Kuffeler, who is spearheading the deal, was previously chief executive and chairman of Provident.
Under the terms of the deal, Provident shareholders will be entitled to receive 8.88 new NSF shares for each Provident share.
Based on NSF's closing share price of 58p on Thursday, the tie-up values Provident at £1.3bn, or 511p per share.
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Mr van Kuffeler said: "This transaction will create a market leader in the non-standard finance sector with a strong position in all four main segments."
He said that "NSF has extensive management expertise and experience, and the correct strategy to turn Provident around and release significant value by combining it with our own fast-growing businesses for the benefit of customers, employees and investors".
Canada's Saputo has announced a £975 million takeover of Dairy Crest.
Under the terms of the deal, Dairy Crest investors will receive 620p per share in cash, an 11.7 per cent premium.
The Dairy Crest board is unanimously recommending the all cash offer.
Lino Saputo Jr, Saputo chairman and chief executive, said: "We believe that under Saputo ownership, Dairy Crest will be able to accelerate its long-term growth and business development potential and provide benefits to Dairy Crest's employees and stakeholders."
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He added: "This recommended offer represents a compelling opportunity for Dairy Crest shareholders, providing immediate value certainty."
Shares in Cathedral City and Clover owner Dairy Crest jumped 12% to 625p in morning trade.
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