York served in the United States Army during World War II. During his early career, the tall, dark-haired actor was a natural to play characters such as Pat Ryan in the 1940 serial Terry and the Pirates and was given the lead in the 1940 film Li'l Abner. However, he is perhaps most remembered for his role as Bud Searcy in Disney's classic Old Yeller and its 1963 sequel Savage Sam. Beverly Washburn played Lisbeth Searcy, Bud's daughter. York also appeared in The Great Locomotive Chase, Westward Ho, the Wagons!, and Johnny Tremain which were all Walt Disney's productions.