William Daniels

William David Daniels was born on March 31, 1927, in Brooklyn, New York, to Irene and David Daniels, a bricklayer and telephone operator respectively. He grew up in East New York, Brooklyn, and has two sisters, Jacqueline and Carol. Daniels began performing as part of a singing family act in Brooklyn, making his television debut in 1943 as part of that variety act on NBC, then a single-station network in New York. That same year he made his Broadway debut in Life with Father, a production co-authored by Howard Lindsay, who later advised Daniels to use the GI Bill to pursue formal training in drama. Daniels was drafted into the U.S. Army in 1945 and served in Italy as a disc jockey at an Army radio station. Following his discharge, he enrolled at Northwestern University, graduating in 1949 as a member of Sigma Nu fraternity.

Daniels maintained an active Broadway career spanning from 1903 to 1973, appearing in productions including 1776, A Thousand Clowns, On a Clear Day You Can See Forever, A Little Night Music, Dear Me, The Sky is Falling, Daphne in Cottage D, and One Flew Over the Cuckoo's Nest. He received an Obie Award for The Zoo Story in 1960. His most celebrated stage role was John Adams in the musical 1776, which opened in 1969. When he received a Tony Award nomination that year for Featured Actor in a Musical, Daniels refused it, maintaining that the role of John Adams was a leading part rather than a supporting one. He was nonetheless ruled ineligible for the Best Actor category because his name was not billed above the title.

His film career began with a role as a school principal in the 1963 anti-war drama Ladybug Ladybug. In 1965, he reprised his Broadway role as a child welfare worker in the film adaptation of A Thousand Clowns. Two years later, he appeared in The Graduate as Mr. Braddock, the father of Dustin Hoffman's character Benjamin Braddock. He also appeared as Howard Maxwell-Manchester in Two for the Road. Daniels reprised his stage portrayal of John Adams in the 1972 film version of 1776, and returned to the role in the 1978 and 1979 films The Bastard and The Rebels. His first network television appearance came in 1952, when he portrayed the young John Quincy Adams in the Hallmark Hall of Fame drama A Woman for the Ages. He reprised that role in 1976, playing the middle-aged and elder John Quincy Adams in the PBS miniseries The Adams Chronicles. Daniels is notable for having portrayed, across film and television, the three most prominent members of the Adams political family: John Adams, Samuel Adams, and John Quincy Adams.

On television, Daniels starred as police chemist Carter Nash, the actual identity of the eponymous superhero, in the 1967 sitcom Captain Nice. From 1982 to 1988, he played the acerbic surgeon Dr. Mark Craig on the drama series St. Elsewhere, earning five consecutive Primetime Emmy Award nominations for Outstanding Lead Actor in a Drama Series from 1983 to 1987 and winning in both 1985 and 1986. In 1986, Daniels and his wife, actress Bonnie Bartlett, who played his fictional wife on the series, won Emmy Awards on the same night, becoming the first married couple to achieve that distinction since Alfred Lunt and Lynn Fontanne in 1965. Concurrently with St. Elsewhere, Daniels provided the voice of the artificially intelligent car KITT on Knight Rider from 1982 to 1986, a role he reprised in the 1991 television movie Knight Rider 2000, in AT&T and GE commercials, in two episodes of The Simpsons, at the Comedy Central Roast of David Hasselhoff, in the theatrical comedy The Benchwarmers, and in the 2015 video game Lego Dimensions. He also co-starred in the 1978 telefilm Sarah T. - Portrait of a Teenage Alcoholic and was a regular on the 1970s series Freebie and the Bean and The Nancy Walker Show.

From 1993 to 2000, Daniels portrayed educator George Feeny at John Adams High School in the sitcom Boy Meets World, a role that earned him four People's Choice Award nominations. He reprised the character in the pilot episode of the spinoff series Girl Meets World in 2014 and made additional appearances in its second and third seasons. In 2012, he appeared in the ninth season of Grey's Anatomy as Dr. Craig Thomas, a mentor to Dr. Cristina Yang, played by Sandra Oh; the character died mid-season while performing a cardiac procedure. In early 2023, Daniels completed filming the role of King Henry VI in an upcoming production of Richard III. On October 14, 2025, at the age of 98, he appeared as a surprise guest on Dancing with the Stars.

Daniels has been married to actress Bonnie Bartlett since June 30, 1951. In 1961, Bartlett gave birth to a son who died within 24 hours; the couple subsequently adopted two sons, Michael and Robert, and have four grandchildren. Both Daniels and Bartlett served on the board of directors of the Screen Actors Guild. Daniels served as president of the organization from 1999 to 2001, leading the union during the 2000 commercial actors strike. In 2017, he published a memoir titled There I Go Again: How I Came to Be Mr. Feeny, John Adams, Dr. Craig, KITT, and Many Others, released by Potomac Books.