San Francisco Ballet School Mateo, and Oakland. After Bolm left in 1937, new Opera ballet mistress Mildred Hirch added a fencing master during her year-long direction; Willam Christensen, previously director of the Oakland Branch School, became SF Opera ballet master and full school director in 1938. As San Francisco Opera Ballet expanded its touring schedule, it became increasingly difficult for Christensen to serve in both of his professional capacities. In 1940, his brother Harold Christensen took over the position of school director. In 1942, the two Christensen brothers purchased both the ballet company and the school from the Opera Association, renaming the company San
San Francisco in the 1970s San Francisco continued to contribute significantly to San Francisco in the 1970s. The black population of San Francisco peaked in the early 1970s; in 1972 one in seven citizens was black. Many African-American residents still lived in the Fillmore district, which had given birth to a thriving jazz scene and been called the Harlem of the West in the 50s and 60s. However, urban redevelopment began to push blacks out of the Fillmore in the late 1960s; by 1980 San Francisco's black population had decreased by 10%. Some Japanese-Americans had returned to the Fillmore after their internment during World War