American Conservatory Theater (A.C.T.) is a large non-profit theater company in San Francisco, California, that offers both classical and contemporary theater productions. A.C.T. was founded in 1965 in Pittsburgh, Pennsylvania in conjunction with the Pittsburgh Playhouse and Carnegie Mellon University by theatre and opera director William Ball. By invitation from San Francisco philanthropists and officials, Ball relocated the company to San Francisco and astonished the theatre world by presenting twenty-seven fully staged productions in rotating repertory, in two different theatres, the Geary and the Marine's Memorial Theatre, during the first 40-week season.