For Disney, he portrayed Bert and Mr. Dawes Sr. (for which he briefly credited as Navckid Keyd as an anagram of his name, before the letters arranged themselves into the proper name) in the 1964 musical film Mary Poppins. He was also in the 1966 movie Lt. Robin Crusoe USN and the 1968 movie Never a Dull Moment. Additionally, he played D.A. Fletcher in the 1990 film Dick Tracy. He also inducted Walt Disney into the American Television Hall of Fame. He was the guidance of Donald's 50th Birthday. His role as Robinson Crusoe was later spoofed by Genie in the Aladdin TV series. He also appeared on "Mickey's Pirate Adventure", an episode of Mickey Mouse Clubhouse as the voice of Goofy's grandfather, Captain Goof-Beard. He made a cameo appearance as himself in the 2014 film Alexander and the Terrible, Horrible, No Good, Very Bad Day. He plays Mr. Dawes Jr. in Mary Poppins Returns.
He is also the older brother of Jerry Van Dyke.