Roth appeared in over twenty television shows and movies beginning in 1961 with a small role in an episode of Tallahassee 7000. He had roles in several notable films of the early 1970s, such as What's Up, Doc? where he played 'Mr Jones', Catch-22 as 'Doctor', One Flew Over the Cuckoo's Nest as 'Woolsey', and Harry and Tonto as 'Vegas Gambler'. He also had roles in numerous smaller films as well as several TV shows such as The Monkees as 'Howard Needleman,' Tales from the Dark Side as 'Sam Larchmont/Wilson Farber' as well as Cagney and Lacey as 'Sullivan'.