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.