Wallace Michael Shawn (born November 12, 1943) is an American actor, voice actor, comedian, playwright and essayist. His 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), Mr. Wendell Hall in Clueless (1995) and providing the voice of Rex in the Toy Story franchise. He has also appeared in a variety of television series, including recurring roles as Grand Nagus Zek in Star Trek: Deep Space Nine (1993 -- 1999) and Cyrus Rose in Gossip Girl (2008 -- 2012).
who played the grand nagus on deep space nine
Wallace Michael Shawn