Léon Bakst(Russian: Леон (Лев) Николаевич Бакст, Leon (Lev) Nikolaevich Bakst) – born as Leyb-Khaim Izrailevich(later Samoylovich) Rosenberg, Лейб-Хаим Израилевич (Самойлович) Розенберг (27 January (8 February) 1866 – 28 December 1924) was a Russian painter and scene and costume designer. He was a member of the Sergei Diaghilev circle and the Ballets Russes, for which he designed exotic, richly colored sets and costumes. (Source: Wikipedia)

See also http://www.vam.ac.uk/content/articles/b/biography-of-leon-bakst/