From 1905 until his dismissal by the Nazis in 1933 Ludwig Otto Blumenthal worked as a professor of mathematics at the University (RWTH) of Aachen. From 1906 to 1938 he was the long-term managing editor of the "Mathematische Annalen", the most prestigious mathematical journal of that time. He is still well known among mathematicians under the name "Otto Blumenthal". In July 1939 he and his wife emigrated to the Netherlands.
They found a first refuge in Huize Zuilenveld in Oud-Zuilen near Utrecht. This was a home for emigrated German Jewish scientists and their families provided by a "protestantsch hulpcomité voor uitgewekenen om ras en geloof". When the house was seized for military purposes in October 1939 Otto Blumenthal and his wife moved into a flat in Delft and later, when they were forced to leave Delft in September 1940, to Utrecht.
As he did not get a work permit in the Netherlands they lived mainly from the financial support by the 'academisch steunfonds' (academic support fund), until this task was taken over by the Jewish Council in Amsterdam. He got interned in the Vught concentration camp (22 April 1943) and Westerbork (10 May 1943). In January 1944 he was deported to Theresienstadt. According to the archive of Theresienstadt, the Terezín Initiative Institute in Prague and eyewitnesses Otto Blumenthal died there on 13 November 1944.
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See for more information (in German) the website RWTH-Aachen University.