A familiar actor in German television and cinema, Teuscher combined work on-camera roles with dubbing work. He dubbed Pat Hingle in two Batman movies, Charles Durning in State and Main, John Hurt in Second Best, Carl Reiner in Dead Men Don't Wear Plaid, and Jon Polito in several projects. In television, he dubbed Alfred Hitchcock on Alfred Hitchcock Presents and Mark Metcalf as the Master on Buffy the Vampire Slayer. Animation roles include the Flying Dutchman on SpongeBob SquarePants, the king of Atlantis in Atlantis: The Lost Empire, and Fowler in Chicken Run.
He died on October 21, 2015, at the age of 78.