Jack Leonard "J.L. " Warner (August 2, 1892 – September 9, 1978), born Jacob Warner in London, Ontario, Canada, was the president and driving force behind the Warner Bros. Studios in Hollywood, Los Angeles, California. Warner's 45-year career was longer than that of any other traditional Hollywood studio mogul. 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.
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