Richard Treat Williams (born December 1, 1951) is a Golden Globe and Emmy award-nominated American actor and children's book author who has appeared on film, stage and television. He first became well known for his starring role in the 1979 film Hair, and later also starred in the films Prince of the City, Once Upon a Time in America, The Late Shift and 127 Hours. From 2002 to 2006, he was the lead of the television series Everwood and was nominated for two Screen Actors Guild Awards.