Joachim Weingart received a traditional Jewish as well as a secular education. He studied at the Weimar School of Applied Arts in 1912 and later at the Academy of Fine Arts in Vienna. He then moved to Berlin, where he worked with Archipenko for two years. After World War I Weingart returned to Galicia, worked and exhibited in Lvov, and in 1925 moved to Paris. In Paris Weingart continued painting and exhibited his work in the official salons and in galleries, but he underwent a mental crisis which, no doubt, changed the course of his life and work. He spent two years in a mental hospital, where he created some of his finest works.
In April 1942, Joachim Weingart was interned in the camp of Pithiviers and was deported to Auschwitz on July 7, 1942.