Besides Star Trek, Daniels worked as sound mixer on three other television series, Honey West, Mission: Impossible (also produced by Desilu), and The Brady Bunch. He began his career as a cable person on Fritz Lang's 1941 film, Western Union. Daniels was also the sound engineer on the 1966 science fiction film The Bubble, which featured Vic Perrin in the cast, and was produced by Marvin Chomsky (who also served as the art director on the film).