In 2005, Rossant was appointed Vice President of Communications and Public Affairs of Paris-based Publicis Groupe, one of the world's largest communications holding companies [REF].
In October 2010, PublicisLive organized the 13th Sommet de la Francophonie, (Worldwide Francophone Summit) which was held in Montreux, welcoming over 3,000 participants and 40 heads of states and delegations.