anchor: Best known for his Broadway musicals West Side Story and Fiddler on the Roof , his greatest contribution is said to be the integration of Modernist innovations and popular dance steps with classical ballet.
positive: He is known for the integration of Modernist innovations and popular dance steps with classical ballet, and his most popular Broadway musicals were West Side Story and Fiddler on the Roof.
negative: He was a failure on broadway, none of his shows were ever successful and he has made zero important contributions to the theater world.