Van Gogh is not an impressionist painter. Open an art history book and you will find him in a category with Lautrec, Degas and Gauguin,etc called "Post-Impressionism". The problem was these four artists all painted in different styles and were painting at the same time and were not impressionists but did not advance their painting into their own"school" so what do they call them Post Impressionists because they didn't know how to categorize them. This means we get to name Van Gogh's style if you can put it in a box. Nobody else really painted like him for hundreds of years until we get to the action painters or expressionists. He was unique.