Jack Warner (J.L. for short) (August 2, 1892 - September 9, 1978), born John Eichelbaum in London, Ontario, Canada of a Polish-Jewish family, was the president and driving force behind the highly successful development of Warner Brothers Studios in Hollywood, Los Angeles, California. Wikipedia
The definitive Wikipedia entry for Jack Warner. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Jack_Warner