Leo Burnett's head of mobile and social, James Kirkham, is leaving the agency.
Kirkham is co-founder of digital agency Holler which was acquired by Leo Burnett in 2011, and has most recently been involved in the reconfiguration of the group into a single multi-disciplinary agency.He is looking for opportunities outside of the industry.
Commenting on the news, Paul Lawson, chief executive of Leo Burnett London, said: “James has been a fantastic colleague and Holler has been a brilliant acquisition.
"He and I have been working together during the last year to fully integrate Holler into the main agency before he moves on to the next phase of his career. We wish him the very best for the future," he added.
Kirkham asserted that after an "incredible" fifteen years with the company "the time is right to move on."