As an a cappella enthusiast, he has sung in a group called "Dick Van Dyke and The Vantastix" since September 2000. The quartet has performed several times in Los Angeles as well as on Larry King Live, The First Annual TV Land Awards, and sang the national anthem at three Los Angeles Lakers games including a nationally televised NBA Finals performance on NBC. Van Dyke was made an honorary member of the Barbershop Harmony Society in 1999.
Van Gogh's works are among the world's most expensive paintings. Those sold for over US$100 million (today's equivalent) include Portrait of Dr Gachet, Portrait of Joseph Roulin and Irises. The Metropolitan Museum of Art's version of Wheat Field with Cypresses was acquired in 1993 for US$57 million. In 2015 L'Allée des Alyscamps sold for US$66.3 million at Sotheby's, New York, exceeding its reserve of US$40 million.
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 took a more dramatic turn in the 1990s. He starred in the popular crime drama Diagnosis Murder alongside his real-life son, Barry Van Dyke. Debuting in 1993, the series featured Van Dyke as Dr. Mark Sloan, a medical professional who helped the police solve crimes. The series ended in 2001, but Van Dyke didn't stay away from the small screen for long. He played another amateur detective in a series of TV movies, beginning with 2006's Murder 101. That same year, the actor appeared in the Ben Stiller comedy Night at the Museum.
Van Gogh stayed within what he called the "guise of reality", and was critical of overly stylised works. He wrote afterwards that the abstraction of Starry Night had gone too far and that reality had "receded too far in the background". Hughes describes it as a moment of extreme visionary ecstasy: the stars are in a great whirl, reminiscent of Hokusai's Great Wave, the movement in the heaven above is reflected by the movement of the cypress on the earth below, and the painter's vision is "translated into a thick, emphatic plasma of paint".
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.