Graduated in Contemporary History from the prestigious Sorbonne University, Gildas started his carrier as a teacher at the French Lycee in Baghdad just before the invasion of Kuwait by Iraq and the American intervention, and then in Hong Kong.
He decides to return permanently to France in 1994 where he joined Fuzzy Communication - IT segment communication Agency as Commercial Director.
Gildas founded Sidièse in december 1999, a communication agency focussing on soutenable development and responsible Communication.
President of the Sustainable Development Committee of the AACC (french association of communication agencies) and member of Adwiser collective, he is involved in several schools and professional meetings on the themes of "Communication and Sustainable Development".