<P> Daniels's first network television appearance came in 1952 when he portrayed the young John Quincy Adams, eldest son of John and Abigail Adams in the Hallmark Hall of Fame drama A Woman for the Ages . In 1976, he reprised the role as the middle - aged and elder John Quincy Adams in the acclaimed PBS miniseries The Adams Chronicles . He starred in the short - lived series Captain Nice as police chemist Carter Nash . He appeared as acid - tongued Dr. Mark Craig in St. Elsewhere from 1982--88, for which he won two Emmy awards . Concurrently, he provided the voice of KITT in Knight Rider from 1982--86 . Daniels said in 1982, "My duties on Knight Rider are very simple . I do it in about an hour and a half . I've never met the cast . I haven't even met the producer ." </P> <P> He reprised the voice - only role of KITT in 1991 for the television movie Knight Rider 2000, again in the movie The Benchwarmers . He performed the role in AT&T and GE commercials about talking machines, and twice in The Simpsons as well as at the Comedy Central Roast of his co-star David Hasselhoff . He reprised the role of KITT in the 2015 Lego - themed action - adventure video game Lego Dimensions . </P> <P> Daniels portrayed teacher (later principal) George Feeny at John Adams High School in Boy Meets World from 1993 to 2000 . In addition to the previously mentioned 1967 superhero sitcom Captain Nice, he was a regular on the 1970s TV series Freebie and the Bean and The Nancy Walker Show . </P> <P> A familiar character actor, he has appeared as a guest star on numerous TV comedies and dramas, including Soap, The Rockford Files, Quincy, M.E., Kolchak: The Night Stalker, and many others . In 2012, Daniels appeared in the ninth season of Grey's Anatomy as Dr. Craig Thomas, an unlikely mentor to the character of Dr. Cristina Yang played by actress Sandra Oh . His character, Dr. Thomas, died in the operating room while performing a procedure to repair a heart defect midway through the season, which forced Yang to move back to Seattle . </P>

Who played mr feeny on boy meets world
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