With missionary zeal and an unerring eye, the dealer Paul Cassirer (1871–1926) brought French Impressionism to Germany. In his Berlin gallery, he introduced Degas, Cézanne, Manet, Monet, Renoir, and Van Gogh to German collectors and institutions at a time when their work was still controversial. Cassirer was equally committed to the Berlin Secession and to German Impressionism—artists such as Max Liebermann, Max Slevogt, and Lovis Corinth. He also championed early figures of the avant-garde. This show marks the centenary of Cassier’s death with an exhibition of more than 100 works by artists he promoted. —Elena Clavarino