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As co-head of production at Warner Bros. Studios, Warner worked with his brother, Sam Warner, to procure the technology for the film industry's first talking picture, The Jazz Singer (1927). After Sam's death, Jack clashed with his surviving older brothers, Harry and Albert Warner. He assumed exclusive control of the company in the 1950s when he secretly purchased his brothers's shares in the business after convincing them to participate in a joint sale of stocks.

Juliane Lorenz (born 2 August 1957) is a German film editor best known for her work with and relationship to director Rainer Werner Fassbinder. Lorenz is the head of the Fassbinder Foundation, an organization that seeks to preserve and promote the filmmaker's legacy. She has authored or edited several books on the director's life and work, and has directed a documentary on the same subject.