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
Jack L. Warner as the new company president. Shortly after the deal was closed, Jack Warner announced that the company and its subsidiaries would be "directed more vigorously to the acquisition of the most important story properties, talents, and to the production of the finest motion pictures possible". The two brothers had often argued, and earlier in the decade, studio employees claimed they saw Harry chase Jack through the studio with a lead pipe, shouting, "I'll get you for this, you son of a bitch" and threatening to kill him. This subterfuge, however, proved too much for Harry. He never spoke to Jack