After studying chemistry, Guillaume entered the ISIPCA. In 1998, faithful to his will and desire to be engaged to the world of perfumery, he entered the Bel Aesthète promotion of the MST ISIPCA. Wishing to broaden his knowledge and develop his creativity, Guillaume then entered the Givaudan School of Perfumery. In 2003, at the age of 27, he joined the fine fragrance team of perfumers at Givaudan Paris.Some of Guillaume's notable fragrances include: Fragrance Du Bois 'Oud Rouge Intense', Fragonard 'Les Naturelles Vetiver', Sisley 'Eau de Sisley No. 1', Balmain 'Ambre Gris', Van Cleef & Arpels 'First 1er Bouquet', Oscar de la Renta 'Oscar Red Orchid'