Wallace Michael "Wally" Shawn (born November 12, 1943) is an American actor, voice actor, playwright and essayist, best known for appearing in film roles, such as Wally Shawn in the Louis Malle-directed comedy-drama My Dinner with Andre (1981), Vizzini in The Princess Bride (1987), Ezra in The Haunted Mansion, providing the voice of Rex in the Toy Story franchise, providing the voice of Gilbert Huph in The Incredibles (2004), and providing the voice of Calico in Cats & Dogs: The Revenge of Kitty Galore (2010). He also starred in a variety of television series, including Gossip Girl and recurring appearances as Grand Nagus Zek in Star Trek: Deep Space Nine (1993–99).