Verklin joined Carat in 1998 as CEO of Carat Americas and in 2005, when he was also appointed chairman of Carat Asia Pacific.
Terry Savage, executive chairman of the festival said: "David is a highly respected international leading authority and visionary of the media business."
Verklin said: "This is an important moment in the history of commercial persuasion and marketing sciences."
Bob Scarpelli, chairman and chief creative office of DDB Worldwide, is to chair the Film and Press 2007 Cannes Lions juries, while Rory Sutherland, vice-chairman of Ogilvy Group UK, has been appointed as chair of the 2007 Cannes Direct Lions jury.