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Daniel Davis is an American film, stage 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. Wikipedia