During 1950 to 1960, he edited films for such notable French New Wave directors as Agnès Varda and Georges Franju.

[2] Une aussi longue absence was written by Marguerite Duras, featured Alida Valli in a major role, and included music by Georges Delerue.

His second feature Codine was also screening in competition at the 1963 Cannes Film Festival, where Colpi won the prize for Best Screenplay.

He edited André Antoine's forgotten film L'Hirondelle et la Mésange (The Swallow and the Titmouse) to a 79-minute feature that premiered in 1984.

[1] In addition to directing, editing, acting, sound recording, and a variety of functions in the post-War years, he was featured in a French television series, L'Histoire du cinéma français par ceux qui l'ont fait (The History of French Cinema By Those Who Made It) in 1974, and he continued to work into the 1990s.