Jack L. Warner Jack L. Warner Jack Leonard "J. L." Warner (August 2, 1892 – September 9, 1978), born Jacob Warner in London, Ontario, was a Jewish Canadian-American film executive who was the president and driving force behind the Warner Bros. Studios in Burbank, California. Warner's career spanned some 45 years, its duration surpassing that of any other of the seminal Hollywood studio moguls. As co-head of production at Warner Bros. Studios, he worked with his brother, Sam Warner, to procure the technology for the film industry's first talking picture. After Sam's death, Jack clashed with his surviving older brothers, Harry and Albert
Albert Warner Inferno" and wary of Edison's growing monopoly, decided to leave Laemmle and establish an independent film production company for himself and his three brothers, Warner Features; Albert and Harry opened an office in New York, while Sam was sent to operate the company's new Los Angeles film exchange division, and Jack was sent to run the company's new San Francisco film exchange division. In 1918, thanks in part to a loan from Ambassador James W. Gerald, the brothers expanded operations and established a studio near Hollywood, California Sam and Jack moved to the West Coast to produce films while Albert