All DDB's global business directors on regional and worldwide accounts will report directly to Brossard, who will develop DDB's worldwide client offering.
Brossard will relocate to New York and report to Ken Kaess, the president and chief executive of DDB Worldwide. He will remain a member of the DDB Worldwide executive committee, as well as chairing the DDB France supervisory board.
Brossard said: "Our philosophy has long been about bringing the best creative solutions to our clients. My new position is a reflection of that."