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.
Largely on the basis of the works of the last three years of his life, van Gogh is generally considered one of the greatest Dutch painters of all time. His work exerted a powerful influence on the development of much modern painting, in particular on the works of the Fauve painters, Chaim Soutine, and the German Expressionists. Yet of the more than 800 oil paintings and 700 drawings that constitute his life’s work, he sold only one in his lifetime. Always desperately poor, he was sustained by his faith in the urgency of what he had to communicate and by the generosity of Theo, who believed in him implicitly. The letters that he wrote to Theo from 1872 onward, and to other friends, give such a vivid account of his aims and beliefs, his hopes and disappointments, and his fluctuating physical and mental state that they form a unique and touching biographical record that is also a great human document.
Van Gogh returned to Cuesmes in August 1880, where he lodged with a miner until October. He became interested in the people and scenes around him, and recorded them in drawings after Theo's suggestion that he take up art in earnest. He travelled to Brussels later in the year, to follow Theo's recommendation that he study with the Dutch artist Willem Roelofs, who persuaded him – in spite of his dislike of formal schools of art – to attend the Académie Royale des Beaux-Arts. He registered at the Académie in November 1880, where he studied anatomy and the standard rules of modelling and perspective.
In November 1959, Van Dyke made his Broadway debut in The Girls Against the Boys. He then played the lead role of Albert Peterson in Bye Bye Birdie, which ran from April 14, 1960, to October 7, 1961. In a May 2011 interview with Rachael Ray, Van Dyke said that when he auditioned for a smaller part in the show he had no experience as a dancer, and that after he sang his audition song he did an impromptu soft-shoe out of sheer nervousness. Gower Champion, the show's director and choreographer, was watching, and promptly went up on stage to inform Van Dyke he had the lead. An astonished Van Dyke protested that he could not dance, to which Champion replied: "We'll teach you". That musical won four Tony awards including Van Dyke's Best Featured Actor Tony, in 1961. In 1980, Van Dyke appeared as the title role in the first Broadway revival of The Music Man.