Leopold Lowenheim

Leopold Lowenheim (26 June 1878 in Krefeld – 5 May 1957 in Berlin) was a German mathematician, known for his work in mathematical logic. The Nazi regime forced him to retire because under the Nuremberg Laws he was considered only three quarters Aryan. In 1943 much of his work was destroyed during a bombing raid on Berlin. Nevertheless, he survived the Second World War, after which he resumed teaching mathematics.

Lowenheim (1915) gave the first proof of what is now known as the Lowenheim–Skolem theorem, often considered the starting point for model theory.