Van Dyke received a Grammy Award in 1964, along with Julie Andrews, for his performance on the soundtrack to Mary Poppins. In 1970, he published Faith, Hope and Hilarity: A Child's Eye View of Religion a book of humorous anecdotes based largely on his experiences as a Sunday School teacher. Van Dyke was principal in "KXIV Inc." and owned 1400 AM KXIV in Phoenix (later KSUN) from 1965 to 1985.
Van Dyke left high school in 1944, his senior year, intending to join the United States Army Air Forces for pilot training during World War II. Denied enlistment several times for being underweight, he was eventually accepted for service as a radio announcer before transferring to the Special Services and entertaining troops in the continental United States. He received his high school diploma in 2004 at the age of 78.