After graduating from Science Po Paris, Sébastien began his career as a project manager at DDB.

In 2007, he decided to focus on digital strategies and joined Megalo, a digital creative hot shop, where he became a consultant for Warner Bros, Lacoste and Bulgari among others.

He joined BETC's Strategic Planning department in 2011, where he drew on his dual expertise in both digital and brand strategies to work on major international brands such as evian, Air France, Sephora or Lacoste among others.

In 2013, he created the engagement and communications planning department, and in this capacity, built communications strategies and digital thinking for all the agency's clients.

End of 2021, Sebastien was appointed Global Chief Strategy Officer of BETC Group. He leads the Consulting and Strategic Planning practice as well as the international development of the agency and thought Leadership for the Havas network (Prosumer research, X INDEX). Sébastien supervises all brand and digital strategies for the agency’s portfolio of clients and is directly involved in building strategies for Canal +, EDF or Lacoste.