He met Robert Delaunay, Sonia Terk, and Henri Rousseau in 1907, and opened his art gallery in 1908, rue Notre-Dame-des-Champs (Paris) where he exhibited Georges Braque, Jean Metzinger, Sonia Delaunay, André Derain, Raoul Dufy, Auguste Herbin, Jules Pascin, and Pablo Picasso.
[4] Uhde and Sonia Terk married in 1908 (London), reportedly a marriage of convenience which masked his homosexuality.
[4] At the outbreak of World War I, many German nationals living in France had their possessions sequestered by the French state.
As a result, Uhde's collection (including works by Georges Braque, Raoul Dufy, Juan Gris, Auguste Herbin, Marie Laurencin, Fernand Léger, Jean Metzinger, Pablo Picasso, Jean Puy, and Henri Rousseau) was confiscated in 1914 and sold by the government in a series of auctions at the Hôtel Drouot in 1921.
A Jew, he spent the Second World War in hiding in southern France, at one point helped by the art critic and resistance leader Jean Cassou.