While working on Knight Rider, Daniels was also starring as Dr. Mark Craig on NBC's medical drama St. Elsewhere. He later played Mr. Feeney in the sitcom Boy Meets World. He had also did a brief cameo as the voice of a robot airplane pilot in an episode of the cartoon “Kim Possible”. Off-screen, he was president of the Screen Actor's Guild from 1999-2001
He was never actually seen in person in an episode. But if you just close your eyes and listen, you will recognize him immediatly.