 Kochno wrote the libretto of Stravinsky's "Mavra" (1921), George Auric's "Les Fâcheux" (1924), Henri Sauguet's "La Chatte" (1927), and of Sergei Prokofiev's ballet score "The Prodigal Son" (1929).In 1925, he had an affair with Cole Porter, with whom he carried on a lengthy correspondence.Upon Diaghilev's death, Kochno and Serge Lifar tried but failed to hold the Ballets Russes together.