Wallace Michael \"Wally\" Shawn is an American actor, voice actor, stand-up comedian, singer, dancer, 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, Vizzini in The Princess Bride, Ezra in The Haunted Mansion, providing the voice of Rex in the Toy Story franchise, providing the voice of Gilbert Huph in The Incredibles, and providing the voice of Calico in Cats & Dogs: The Revenge of Kitty Galore. 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.
His plays include The Designated Mourner, Aunt Dan and Lemon, and Grasses of a Thousand Colors. He also co-wrote the screenplay for My Dinner with Andre with Andre Gregory, and he scripted Vanya on 42nd Street, a film adaptation of Anton Chekov's play Uncle Vanya. His latest film from June 2014 was A Master Builder based on the play by Henrik Ibsen.