George Balanchine, born Giorgi Melitonis dze Balanchivadze in Saint Petersburg, Russia, to Georgian parents, was one of the 20th century's foremost choreographers, a pioneer of ballet in the United States, co-founder and balletmaster of New York City Ballet: his work created modern ballet, based on his deep knowledge of classical forms and techniques. He was a choreographer known for his musicality; he did not illustrate music but expressed it in dance and worked extensively with Igor Stravinsky, his contemporary.