 At the end of World War II, Kochno entered into a partnership with Roland Petit, with whom he founded the Ballets des Champs-Élysées.His later career included a position as ballet director with the Ballet Russe de Monte Carlo, where he became an influential figure in post-World War II French ballet.Kochno authored several works, including "Diaghilev and the Ballets Russes", a record of the Diaghilev era, and "Christian Bérard", a scrapbook of artwork by Bérard, Kochno's former lover and collaborator, along with reminiscences.