San Francisco Ballet is a ballet company, founded in 1933 as the San Francisco Opera Ballet under the leadership of ballet master Adolph Bolm. The company is currently based in the War Memorial Opera House, San Francisco, under the direction of Helgi Tomasson. San Francisco Ballet was the first professional ballet company in the United States. It is among the world's leading dance companies, presenting over 100 performances annually, with a repertoire that spans both classical and contemporary ballet. Along with American Ballet Theatre and the New York City Ballet, San Francisco Ballet has been described as part of the "triumvirate of great classical companies defining the American style on the world stage today.