The move is a significant promotion for Mr. Sadoun, and appears to be the biggest promotion among Publicis executives in the reorganization. He was named CEO of Publicis Worldwide in October 2013, a promotion that even then was considered a big vote of confidence from Publicis Groupe executives. Speculation has long been around that Mr. Sadoun would be an heir apparent of Publicis Groupe's chief exec Maurice Levy, and this move will add fuel to that fire. Prior to being named CEO of Publicis Worldwide, Mr. Sadoun ran the namesake agency's European operation