Jack Leonard Warner was a Canadian-American film executive, who was the president and driving force behind the Warner Bros. Studios in Burbank, California. Warner's career spanned over 55 years, surpassing that of any other of the seminal Hollywood studio moguls.

Warner Bros. Entertainment Inc. is an American film and entertainment studio headquartered at the Warner Bros. Studios complex in Burbank, California, and a subsidiary of Warner Bros. Discovery (WBD). Founded in 1923 by four brothers, Harry, Albert, Sam, and Jack Warner, the company established itself as a leader in the American film industry before diversifying into animation, television, and video games, and is one of the "Big Five" major American film studios, as well as a member of the Motion Picture Association (MPA).