A pianist with a classical training, Guy-Roger first learned music at the Conservatoire, then in the United States and again in France at the Schola Cantorum. Upon graduation he started a career as an independent composer in 2002. That same year he composed the original soundtrack of his first full feature movie "Les Yeux Sec". The movie was later selected at the 2003 Cannes Festival as part of the Directors' Fortnight. Since then, he scored several long feature films, at an international level (France, USA, Canada,...). His work also covers trailers, videogames, commercial TV spots, theatrical plays, and TV series and documentaries broadcasted on major networks and cable televisions.