(b Moscow, 3 Jan. 1904; d Paris, 8 Dec. 1990)
Russian-French ballet librettist and dance writer. In 1920 he became Diaghilev's secretary and advised him closely on many ballets. He wrote several librettos for Les Ballets Russes including Les Fâcheux (1924), Zéphire et Flore (1925), La Chatte (1927), The Gods Go a-Begging (1928), and Prodigal Son (1929). After Diaghilev's death he became artistic adviser of Ballets Russes de Monte Carlo where he wrote librettos for Cotillon and Jeux d'enfants (both 1932) and then in 1933 was co-founder with Balanchine of Les Ballets 1933. From 1934 to 1937 he was back with the Monte Carlo company then in 1945 he wrote the libretto for Les Forains whose success led to the founding, with Petit, of Les Ballets des Champs-Elysées. He was co-director of the company until 1951 and his several librettos for Petit included Les Amours de Jupiter and Le Bal des blanchisseuses (both 1946). He was author of Le Ballet (Paris, 1954) and Diaghilev et Les Ballets Russes (Paris, 1970). Some of his librettos were published under the pen name Sobeka.