Andrew Robertson has been appointed chief executive of BBDO Worldwide, an Omnicom Group agency.
Robertson, 43, the youngest chief executive in the agency's 113 year history, succeeds veteran Allen Rosenshine who relinquishes the post in June.
Rosenshine remains as chairman for at least another two years.
Robertson, president of BBDO as well as chief executive for North America, had been regarded as Rosenshine's heir apparent for some time.
In 2001 he came to New York from London shop, Abbott Mead Vickers BBDO, where he had been chief executive.
"There was a lot of enthusiasm for him here when he walked in the door, and this is a pretty tough group; grafts often don't take well here," said Rosenshine who joined BBDO as a copywriter in 1965.
He rose through the BBDO ranks to become New York creative director in 1975, New York president in 1980 and worldwide chief executive in 1985.
A year later Rosenshine became first chief executive of holding company Omnicom, returning to BBDO in 1989.
At the time he said preferred running an agency rather than an agency company.
Robertson joined AMV BBDO in London in 1995 after working at Ogilvy & Mather, J. Walter Thompson and WCRS.
Data sourced from New York Times; additional content by WARC staff