With financial backing from Adam Kessel and Charles O. Bauman of the New York Motion Picture Company, in 1912 Sennett founded Keystone Studios in Edendale, California, (which is now a part of Echo Park). The original main building, the first totally enclosed film stage and studio in history, is still there. Many important actors started their careers with Sennett, including Mabel Normand, Charlie Chaplin, Raymond Griffith, Gloria Swanson, Ford Sterling, Andy Clyde, The Keystone Kops, Bing Crosby, and W. C. Fields.
Sennett's slapstick comedies were noted for their wild car chases and custard pie warfare. His first comedienne was Mabel Normand, who became a major star (and with whom he embarked on a tumultuous personal relationship). Sennett developed the Kid Comedies, a forerunner of the Our Gang films, and in a short time his name became synonymous with screen comedy. In 1915 Keystone Studios became an autonomous production unit of the ambitious Triangle Film Corporation, as Sennett joined forces with movie bigwigs D. W. Griffith and Thomas Ince.
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