He played Greg Brady on the sitcom The Brady Bunch from 1969 to 1974.
He has remained close friends with many of his Brady Bunch co-stars over the years and they frequently reunite for events and projects related to the show.
He was the oldest of the Brady kids at 16 years old when the show first aired.
He holds the record for longest span of time between playing the same character - over 40 years as Greg Brady.
He wrote an autobiography in 1990 titled Growing Up Brady: I Was a Teenage Greg.
In his post-Brady Bunch career, Williams has guest starred on many TV shows and appeared in films and Broadway productions.