After a first experience at the agency "Cent Degrés"; Jean-Guy joigned FullSIX in 2001 as Senior Consultant. Very quickly, he was promoted Associate Director and managed large accounts such as La Banque Postale, BNP Paribas, Monoprix, Coca-Cola, Club Med and Nokia. In 2010, he became Executive Vice President and co-driver strategy and development agency. He was also in charge of digital business, CRM and social for LVMH, Adidas, PMU and Meetic. In 2014, Jean-Guy took over the management of Publicis Modem. He had joined the group a year before to develop digital activities on all international clients of Publicis France.