Livingston was born in Los Angeles, California, the son of Lillian Rochelle Palyash and Hilliard Livingston. He began his career as a
child actor in the late 1950s. He considers his film debut a role he won as one of the sons of
Paul Newman in the film ''
Rally 'Round the Flag, Boys! (1958) with his older brother Stanley who, by this time, was already working as a child actor. He was let go from the film when he was told that he needed to get glasses to successfully correct his astigmatism. His first professional onscreen appearance was in a small, uncredited role in the 1961 film The Errand Boy, followed by roles as Barry, a neighborhood kid, in The Adventures of Ozzie & Harriet; on The Dick Van Dyke Show; and as "Arnold Mooney", son of banker Theodore J. Mooney portrayed by Gale Gordon, on The Lucy Show. In 1962, he appeared as one of the six children adopted by Debbie Reynolds in the film My Six Loves. In 1963, he joined the cast of the ABC sitcom My Three Sons'' as next door neighbor Ernie Thompson. After
My Three Sons ended in 1972, Livingston landed roles in
Room 222 and
The Streets of San Francisco. He appeared on the stage as Linus in ''
You're a Good Man Charlie Brown, which he reprised when the musical was adapted for television in 1973. Throughout the 1970s and 1980s, he continued to work steadily in films, made-for-TV movies and episodic television including Police Woman, Sidewinder 1
, Simon & Simon, and 1st & Ten. He also appeared throughout the country in stage plays, including Broadway and off-Broadway. In 1974 he appeared in Sons and Daughters, a short-lived CBS series. He most recently appeared on television in episodes of Mad Men, The New Adventures of Old Christine, Two and a Half Men, and Anger Management. Barry Livingston is the only cast member of My Three Sons'' to still have an active Screen Actors Guild Card. ==Select filmography==