William Daniels is an American actor best known for his role as Dr. Mark Craig on the eighties medical drama St. Elsewhere, as well as his role as George Feeny in the sitcom Boy Meets World, appearing in 130 episodes from 1993-2000.
He won the Emmy for Outstanding Lead Actor in a Drama Series two years running (1985 and 1986) for his role on St. Elsewhere.
He is also known for voicing the role of K.I.T.T. in the action series Knight Rider (despite not being credited for the role). He reprised the role in the made-for-TV movies Knight Rider (1982) and Knight Rider 2000 (1991); in the feature film The Benchwarmers (2006); and in two episodes of the animated series The Simpsons.
Other television shows Daniels has acted in include Ironside, Galactica 1980, Quincy M.E., Hart To Hart, Scrubs, Touched By An Angel, The King Of Queens, Kim Possible, The Grim Adventures Of Billy & Mandy, and The Closer.