William Daniels is the father of three children including Robert Daniels, William Daniels Jr., and Michael Daniels.

In 1961, William Daniels’s wife Bonnie Bartlett gave birth to a son, who died 24 hours later. The couple adopted two sons: Michael, who became an assistant director and stage manager in Los Angeles.

William Daniels’s son Robert became an artist and computer graphics designer based in New York City. Daniels was drafted into the U.S. Army in 1945 and stationed in Italy, where he served as a disc jockey at an Army radio station.

William Daniels enrolled at Northwestern University where he graduated from Northwestern in 1949. Daniels had his motion picture debut as a school principal in the 1963 anti-war drama film Ladybug Ladybug.

In 1969, William Daniels starred as John Adams in the Broadway musical 1776, later appearing in the film version in 1972.

William Daniels took on the role of George Feeny in the sitcom Boy Meets World, which earned him four People’s Choice Award nominations.