Wallace Shawn

Wallace Michael Shawn (born November 12, 1943) is an American actor, essayist, playwright, and screenwriter. He is known for playing Vizzini in The Princess Bride (1987), Mr. Hall in Clueless (1995), Dr. John Sturgis in Young Sheldon (2017–2024), and voicing Rex in the Toy Story franchise (1995–present).