An interior architect and designer by training (graduated from ESAG Penninghen), Grégoire went through the agency of Bruno Moinard, Noé Duchaufour Lawrence and Gilles & Boissier where he was able to work on major projects such as the head office from Hermès in Paris, the Cartier boutiques, a private mansion for Veuve Clicquot and more recently the Baccarat hotel in New York. He is currently collaborating with Hermès for the design of furniture collections.
At the same time, he develops his own interior design and furniture projects which earned him the VIA laureate in 2011, 2012, 2013 and 2014 and the "Talent de l'Elegance" laureate at the Sommet du Luxe et de Creation 2017.