Felix Hausdorff published philosophical and literary books as Paul Mongré.
Let me mention that Hausdorff committed suicide (along with his wife) in 1942, to prevent his being sent to a concentration camp. He had tried to escape to the US, but unfortunately no one would sponsor him. So he joined the ranks of mathematicians who were victims of World War II (including some Germans who died at Soviet hands, for example Gentzen).
