Felix Hausdorff was of course a great mathematician, who had major effects on several branches of mathematics. However he also wrote literature and philosophy and was affiliated with important German musicians. When Nazism came to power, Hausdorff failed to escape in time, lost his job, and finally committed suicide in order to avoid being sent to concentration camp.
The above summary of Hausdorff's life comes from reading his wikipedia page and other similar documents. I would like to learn more about him, but for some reason I don't seem to be able to find a book-length biography. (Can there really not be one?)
Question: What is a good source for a detailed biography of Felix Hausdorff?