San Francisco Ballet continued to serve as the school's director until his retirement in 1975. In 1938, the company's first major production was "Coppélia", choreographed by Willam Christensen. In 1940, it staged "Swan Lake", the first time that the ballet was produced in its entirety by an American company. On Christmas Eve 1944, the company staged "Nutcracker"—the first complete production of Tchaikovsky's most popular piece ever danced in the United States. In 1942, San Francisco Opera Ballet split into two independent companies, ballet and opera. The ballet half was sold to Willam and Harold Christensen. Willam became artistic director, while Harold took on
San Francisco Ballet the space of a single week in the UNited We Dance Festival. The 49-member orchestra accompanies SF Ballet throughout its winter and spring repertory seasons. It also performs apart from the Company; it debuted solely as an orchestra in 1979 at the Herbst Theatre in San Francisco's War Memorial Veterans Building, playing a program that included works by Haydn, Ives, and Vivaldi. The SFBO is composed of 49 members and headed by Martin West, music director and conductor. As of October 2013, the musicians and staff included: The orchestra was led by Denis de Coteau from 1975 until 1998, when