Mindshare UK chief executive Mark Creighton is set to leave the agency to take up the chief operating officer role at Dentsu Aegis UK & Ireland.
Creighton has spent the past two years leading the UK arm of Mindshare and before that served as chief operating officer.
Helen McRae, currently joint chief executive EMEA, will assume interim leadership of Mindshare UK in addition to her European role, until a replacement is appointed.
McRae said: “I'd like to thank Mark for his efforts over the past two years in helping to make the Mindshare UK team one of the best in our global network. I now look forward to working with that team more closely and continuing to redefine the future of media for our UK clients.”