Ambroise Vollard is regarded as one of the most important dealers in French contemporary art at the beginning of the twentieth century. He is credited with providing exposure and emotional support to numerous notable and unknown artists, including Paul Cézanne, Aristide Maillol, Renoir, Louis Valtat, Pablo Picasso, André Derain, Georges Rouault, Paul Gauguin and Vincent van Gogh. He is also well known as an avid art collector and publisher.

https://en.wikipedia.org/wiki/Ambroise_Vollard