Post-impressionism as a term was introduced by Roger Fry arranging an exhibition in London of modern French art in 1910. The main represents were Gauguin, Cézanne and Van Gogh. Others were Seurat, Sérusier, Denis, Vallotton, Redon and several Fauve artists (R55, p9). So it did not represent one art-movement. Later on post-impressionism depicts (French) art from the late 1880s until 1905 when Fauvism and Cubism emerged. With Van Gogh, Seurat, Gauguin and Cézanne as the most important representatives (R55, p11). In comparison with Impressionism there is more emphasize on expressing emotions. More info.