From 1956 to 1970 Roux sang annually at Glyndebourne, making his debut as Count Almaviva in Le Nozze di Figaro.
His American debut was at the Lyric Opera of Chicago in 1959; he also appeared at the Vienna Staatsoper and the Deutsche Oper in Berlin, as well as in Amsterdam, Brussels and Lisbon.Roux was known as an intelligent singer and a vivid stage actor.
During the 1950s he appeared in a series of comic French films directed by Julien Duvivier and in later life he taught at the École Normale de Musique de Paris.