Wallace Michael Shawn (born November 12, 1943) is an American actor, voice actor, playwright, essayist, singer, musician, composer, impressionist, host and comedian. His known film roles have included those of 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 voices of Rex in and Gilbert Huph in Disney-Pixar's Toy Story and The Incredibles franchises, the voice of Principal Mazur from A Goofy Movie 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).
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 book Essays was published in 2009 by Haymarket Books. His latest film from June 2014 was A Master Builder based on the play by Henrik Ibsen.