In 1994, Sébastien joined the creative advertising agency DBB Paris to work mainly on the Volkswagen and Fnac accounts. He spent 9 years at DDB as Art Director for high-end brands such as Audi, Sony, Volkswagen, Danone, etc. His career took him from CLM BBDO Paris then on to FCB Paris. Working together with FCB New York, he was the driving force behind the OREO Daily Twist campaign that won the Grand Prix in Social Media category at the Cannes Lions Festival in 2013, as well as a host of prizes at the most prestigious international festivals (Dandad, Clio, One Show, etc.). Since 2016, Sébastien has supported the gyro:paris agency as part of the dentsu group in the roles of Executive Creative Director and General Manager. He currently works for the brands ZEISS, Pilot, Oxford, Midas, IVECO, ecosystem and Foncia. In both 2020 and 2021, gyro:paris was dentsu Group France’s most awarded creative agency.

Since 2023, Sebastien has held the position of Chief Creative Officer at Dentsu Creative France. He has received multiple international creative awards across the majority of the agency's clients: Mentos, Capri Sun, Zeiss, Midas, French Army, Generali, Daikin, etc.