Daniel Kahnweiler [1884-1979], a German art dealer, writer and publisher, established his first gallery in Paris in 1907, becoming one of the most influential dealers of the Paris school. During World War I, as a German national he was soon forced into exile in Switzerland. His stock and gallery were impounded as enemy property by the French state and sold between 1921-1923. He returned to Paris in 1920 and began again from scratch; the new venture was in partnership with André Simon, and called the Galerie Simon. During the Second World War Kahnweiler was again forced to flee Paris, as he was Jewish, but in 1942 was able to turn his gallery over to his Catholic sister-in-law, Louise Leiris, in whose name it continues to operate through the present day.