Grant Mandel Rosenmeyer (born July 3, 1991) is an American actor and screenwriter best known for his roles in The Royal Tenenbaums and on the FOX television sitcom Oliver Beene.
Rosenmeyer first acted on Broadway as Macduff's son in Macbeth and as Gavroche in Les Misérables. In 2001, he made his feature film debut as Ari Tenenbaum, Ben Stiller's son, in Wes Anderson's The Royal Tenenbaums, for which he received a Young Artist Award nomination.
From 2003-2004, Rosenmeyer played the title character in the FOX television sitcom Oliver Beene, produced by Steven Levitan. He has made guest appearances on Late Night with Conan O'Brien, Monk, Jonny Zero, Blue Bloods and Crazy Ex-Girlfriend, among others. He also appeared as Wilson, a Make-A-Wish patient that blackmails Larry David, in a memorable episode of Curb Your Enthusiasm. Additional film credits include Young Mordechai in The Hebrew Hammer.