Jack Leonard "
J. L."
Warner (August 2, 1892 – September 9, 1978), born
Jacob Warner in
London, Ontario, was a
Canadian-born
American film executive who was the president and driving force behind the
Warner Bros. Studios in
Burbank,
California. Warner's career spanned some forty-five years, its duration surpassing that of any other of the seminal Hollywood studio moguls.