Barry Livingston

A veteran actor best known for his childhood role as Ernie Douglas on the hit 1960s sitcom "My Three Sons," Barry Livingston has worked in television and film for decades. After the show, which also starred his brother Stanley, ended, he appeared as Linus in a production of "You're a Good Man, Charlie Brown" and played a recurring character on the 1974 TV drama "Sons and Daughters."

Sticking to mostly to small TV parts, Livingston became remarkably busy in the new millennium, turning up on shows from "Mad Men" to "Grey's Anatomy." The prolific actor also had small parts in the David Fincher films "Zodiac" and "The Social Network."