(b Mannheim, 25 June 1884; d Paris, 11 Jan. 1979).
German-born art dealer, publisher, and writer, who became a French citizen in 1937. In 1907 he opened a gallery in Paris. His first purchases were of Fauvist works, but he is best known as the friend and promoter of the Cubists. In 1912 Braque and Picasso signed contracts giving Kahnweiler exclusive rights to buy their entire outputs. He was also a friend and supporter of Juan Gris, of whom he wrote a standard biography (1947). As a publisher he brought out numerous books illustrated by his artist friends.