Ivanov, Lev (lyĕf ēvä`nôf), 1834–1901, Russian dancer, teacher, choreographer, and ballet-master. Ivanov was assistant to chief ballet-master Marius Petipa Petipa, Marius (märyüs` pĕtēpä`), 1822–1910, French dancer and choreographer, b. Marseilles.
..... Click the link for more information. at the Imperial St. Petersburg Theatres and was instrumental in the development of the classic romantic ballet in Russia. When Petipa fell ill, Ivanov created the choreography for The Nutcracker (1892) to the music of Tchaikovsky. After Tchaikovsky's death, the previously unsuccessful Swan Lake (1877) was revised with choreography by Petipa and Ivanov, each doing alternate acts in varying styles. His other major works include revivals or stagings of La Fille Mal Gardée, The Enchanted Forest, The Magic Flute, and Cinderella. Ivanov sought a closer relationship of dance and music, thereby influencing the work of later choreographers, including Michel Fokine Fokine, Michel (mēshĕl` fōkēn`, Rus.
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Ivanov, Lev (Ivanovich)

(born Feb. 18, 1834, Moscow, Russia—died Dec. 24, 1901, St. Petersburg) Russian dancer and choreographer. He joined the Imperial Ballet in St. Petersburg in 1852 and became lead dancer in 1869. In 1885 he was appointed assistant ballet master under Marius Petipa. He is best known for his choreography of The Nutcracker (1892) and parts of Swan Lake (1895), which he based closely on the structure and emotional content of the music rather than emphasizing virtuoso technique.