Charles-François-Prosper Guérin (Sens, 1875–1939) was a Frenchpost-impressionistpainter. The son of the painter Jean Michel Prosper Guérin, [1] Charles studied with Gustave Moreau in thel'École des Beaux Arts à Paris, and had one exhibition at the Grafton Galleries. Guérin attained some historic notoriety for sitting on the jury of the Salon d'Automne of 1908, which rejected almost all of the paintings of Georges Braque. The other jury members were Henri Matisse,Georges Rouault, and Albert Marquet, all of whom had also been students of Moreau. The jury's action caused Braque--who had been a great success the year before--to withdraw completely from the Salon. Braque subsequently entered into an exclusive contract with the dealer Daniel-Henry Kahnweiler requiring him (and Picasso) to avoid salons, during which time Braque and Picasso developed cubism.