Daniel Davis (born November 26, 1945) is an American stage, screen, and television actor. Davis is best known for portraying Niles the Butler on the sitcom, The Nanny (1993 to 1999), and for his two guest appearances as Professor Moriarty on Star Trek: The Next Generation, affecting an upper class English accent for both roles. He voices the intelligent Cro Magnon, Longhair, from the Longhair and Doubledome cartoon shorts from Cartoon Network's Big Pick. In 2016, Davis played Selsdon Mowbray in the Roundabout Theatre revival of Noises Off at the American Airlines Theatre in New York City. The production opened on January 14 for a limited engagement, running through March 6, 2016.