In addition to Billy Crystal (who he dubbed in the City Slickers movies and When Harry Met Sally, among others), Tennstedt has been the main German voice of many movie stars, such as John Malkovich, Michael Keaton (including Batman, Batman Returns, Mr. Mom, and Birdman), Jeff Bridges (including Iron Man and True Grit), William H. Macy (including Psycho and Mystery Men), and Eric Roberts. Tennstedt also dubbed Mel Gibson (in Galipoli, Hamlet and others), Tom Hanks (including Dragnet, Big, and Bridge of Spies), John Hurt (The Elephant Man), Chris Cooper (The Patriot), Rick Moranis (Spaceballs), Ted Danson (Creepshow), and John Lithgow (The World According to Garp).