Kochno wrote the libretto of Stravinsky's Mavra (1921),[4] George Auric's Les Fâcheux (1924),[5] Henri Sauguet's La Chatte (1927),[6] and of Sergei Prokofiev's ballet score The Prodigal Son (1929).

[8] In 1933 he co-founded, together with George Balanchine, the short-lived but history-making company Les Ballets 1933,[9] which made its debut that summer at the Théâtre des Champs-Élysées.

That same year, he and Edward James commissioned Brecht and Weill's last collaboration, The Seven Deadly Sins,[2] which Balanchine produced, directed, and choreographed.

At the end of World War II, Kochno entered into a partnership with Roland Petit, with whom he founded the Ballets des Champs-Élysées.

[13] Today, two of Oelrich's handwritten love letters to Kochno are in the National Library of France,[14] which "leave no doubt that the two had a sexual relationship.