Jack Kosslyn was a drama coach in the Los Angeles area for over forty years and taught classes at his own studio in Hollywood. He also worked for Universal Studios and Warner Brothers, and coached performers including David Janssen, Mary Tyler Moore and John Travolta. He spent six years with Clint Eastwood's Malpaso Productions as a casting director, dialogue coach, and actor, appearing in small parts in several of Eastwood's films. In the 1980s, he helped form OPACT, the Organization of Professional Acting Coaches and Teachers.

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