Cooper joined Ogilvy & Mather in January last year, reporting to Gerry Human, the chief creative officer. He worked on accounts including the global Philips business.
Before Ogilvy & Mather, Cooper was the iAd head of creative and strategy, EMEA, at Apple for just over a year. His previous roles include global executive creative director on the Nokia account at Wieden & Kennedy.
Cooper was also a creative director at Dare, overseeing the output at the agency’s London and New York offices.
He said: "I’ve had a great time at Ogilvy – it has been fantastic – but I want to move on to explore other exciting opportunities."
It is not yet known whether Ogilvy & Mather London will replace Cooper directly.
In December, Ogilvy & Mather hired Andre Laurentino, the former executive creative director at TBWA\London, as the global executive creative director for Unilever, a role previously held by Human until his elevation to chief creative officer.