The Postman (Joseph Roulin) (1888) by Vincent Van Gogh. Original from the Barnes Foundation. At the prime of his career, Vincent Van Gogh developed a passion for portraits. In one of the many letters he wrote to his brother Theo, Van Gogh expressed his excitement about modern portraits. Throughout his career, Vincent Van Gogh painted more than 20 portraits of Joseph Roulin and his family. The two had a close relationship and friendship, which was the basis of their work together. The two...