William David Daniels is an American actor who is known for his television roles, notably as Mark Craig on the drama series St. Elsewhere, for which he won two Primetime Emmy Awards; the voice of KITT on the television series Knight Rider; and George Feeny on the sitcom Boy Meets World, which earned him four People's Choice Award nominations. He reprised his Knight Rider role in the sequel TV movie Knight Rider 2000 and his Boy Meets World role in the sequel series Girl Meets World. He also portrayed Carter Nash in Captain Nice.

St. Elsewhere is an American medical drama television series created by Joshua Brand and John Falsey, that originally ran on NBC from October 26, 1982, to May 25, 1988. The series stars Ed Flanders, Norman Lloyd, and William Daniels as teaching doctors at an aging, rundown Boston hospital who give interns a promising future in making critical medical and life decisions. The series was produced by MTM Enterprises, which had success with a similar NBC series, the police drama Hill Street Blues, during that same time. The series were often compared to each other for their use of ensemble casts and overlapping serialized storylines.