Wallace Shawn is an American character actor. He had his film debut in 1979’s Manhattan. In the ’80s, he appeared in the films My Dinner with Andre, John Lahr in Prick Up Your Ears, Vizzini in The Princess Bride, among others. He later played Jeff Engels in 5 episodes of The Cosby Show. The following decade, he played Grand Nagus Zek in Star Trek: Deep Space Nine and Stuart Best in Murphy Brown. He also played Mr. James Hall in the 1995 film Clueless, which he reprised in the TV series of the same name. He’s also the voice of Rex in the Toy Story films. His latest film role was as Frank in 2019’s Marriage Story. Back on TV, he played Cyrus Rose in Gossip Girl and currently stars as Dr. John Sturgis in Young Sheldon.