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
Harry Donenfeld to his new underworld contacts having close connections with Hearst newspaper salesman Moe Annenberg. The company was able to move from their earlier downtown location to a twelve-story building in the Chelsea district. 1923 also saw the emergence of the brutal business side of Harry as he took control of Martin Press and forced his two older brothers out of the company, leaving Irving as a minority partner and head printer. Harry then changed the company name from Martin Press to Donny Press. From around 1925, Donenfeld began working with Frank Armer to produce lines of girlie pulps published under