Karl Theodor Vahlen (30 June 1869 – 16 November 1945) was a German mathematician and leading representative of National Socialist German mathematics ("Deutsche Mathematik"). A member of the Nazi Party, he served as the first Gauleiter of Pomerania and was a member of both the SA and SS.
Early years Theodor Vahlen was born in Vienna, the son of a German classical philologist Johannes Vahlen (1830–1911). He went to volksschule and gymnasium in Berlin before studying mathematics at the University of Berlin and receiving his doctorate there in 1893. From 1893, Vahlen was a Privatdozent in mathematics at the Königsberg Albertina University. In 1904, he began teaching at the University of Greifswald, and in 1911 he became an ordinarius professor there. He entered military service at the beginning of World War I with the rank of Hauptmann in the 68th (6th Royal Saxon) Field Artillery Regiment. He was an artillery battery commander on the western front (1914–1915) and the eastern front (1916–1917). Wounded in action on three occasions, he earned the Iron Cross, first and second class. He left the service on 30 September 1918 with the rank of Major of the reserves. He returned to teaching at the University of Greifswald.
Political career Vahlen in 1919 initially became a member of the German National People's Party (DNVP). He co-founded a völkische group in Pomerania in 1922. In November 1923, he and his wife joined the Nazi Party (NSDAP) just before it was outlawed as a result of the Beer Hall Putsch. He then joined the National Socialist Freedom Party, a Nazi front organization, becoming its Gauleiter in Pomerania on 4 April 1924. In May 1924, under its auspices, he was elected to the Reichstag for electoral constituency 6 (Pomerania). From mid-1924 through September 1926, he was the co-publisher of the daily newspaper Norddeutscher Beobachter (North German Observer). When the ban on the Nazi Party was lifted, Gregor Strasser, Hitler's authorized representative for northern Germany, selected him to be the first Party Gauleiter for Gau Pomerania on 22 March 1925 and Hitler confirmed this appointment. Vahlen formally rejoined the Party on 11 May (membership number 3,961). In December 1925, Vahlen joined the National Socialist Working Association, a group of north and northwest German Gauleiters closely associated with Strasser. On 1 March 1926, Vahlen joined Strasser and his brother Otto Strasser in founding the publishing house Kampf-Verlag in Berlin. By 1927, Adolf Hitler was replacing many early Party leaders whom he considered not to have the attributes to be effective party administrators. Consequently, Vahlen was placed on indefinite leave on 1 May 1927 and his newly appointed Deputy, Walther von Corswant, was effectively put in charge. On 21 August, Vahlen was finally dismissed and Corswant officially became Gauleiter. Also in May 1927, Vahlen faced disciplinary actions stemming from an incident a few years earlier when he was Rector at the University of Greifswald. On 11 August 1924, Constitution Day, Vahlen had incited a crowd at the university against the Weimar Republic, which resulted in taking down the flags of the Republic and the Free State of Prussia. The university suspended him for political abuse of his function, and in May 1927 he was dismissed without a pension. Upon his dismissal, Friedrich Schmidt-Ott increased the funding Vahlen had been receiving for his work for the German Navy since 1922. Vahlen worked briefly as an assistant in Johannes Stark's private physics laboratory. In 1930 Vahlen returned to his birthplace and became a lecturer of mathematics at the Technische Hochschule Wien. Once Hitler became Chancellor of Germany on 30 January 1933, Vahlen's career again gained momentum and flourished in Germany as a result of his support for the NSDAP. In that year, he became an ordinarius professor of mathematics at the Humboldt University of Berlin, as successor to Richard Edler von Mises, who emigrated from Germany as a result of the Law for the Restoration of the Professional Civil Service, which was in part directed against professors with Jewish ancestry, which von Mises had. After 1933, Vahlen was a strong advocate of Deutsche Mathematik, a parallel movement to Deutsche Physik, advocated by the Nobel Laureate physicists Philipp Lenard and Johannes Stark; both movements were anti-Semitic. From 1934, he was ordinarius professor at the University of Berlin, a position he held until attaining emeritus status in 1937. In July 1933 Vahlen joined the Sturmabteilung (SA) but on 10 July 1936 he switched to the Schutzstaffel (SS) with the rank of Sturmbannführer and was assigned to the SS Main Office. On 30 January 1938 he was attached to the staff of the Reichsführer-SS. He received successive promotions, the last being to SS-Brigadeführer on 9 November 1943. During the period 1933 to 1937, Vahlen served as third vice president of the Kaiser-Wilhelm Gesellschaft. In January 1934 he became an employee in the University Department of the Prussian Ministry of Science, Art and Public Education, and by 26 April he was head of the department. From 1 June 1934, he was a Ministerial Director and Chief of the Science Office at the Reich Ministry of Science, Education and Culture. Actually, the Science Office was split into two components, WI, a continuation of the Prussian department, and WII, the army office for research. Vahlen was head of WI, but, in actuality, the deputy chief, the chemist Franz Bachér ran WI. From this position, in 1936, Vahlen began publishing the journal Deutsche Mathematik, for which the Berlin mathematician Ludwig Bieberbach was the editor; in the journal, political articles preceded the scholarly articles. On 1 January 1937 Vahlen was relieved of his duties at the Ministry at his own request. Through a manipulation of the election process by Vahlen and his supporters, he was selected as president of the Prussian Academy of Sciences effective 1 January 1939 and remained in this post until 1 April 1943. In April 1944, Vahlen moved to Vienna after his Berlin apartment was destroyed in an air raid and again taught at the Technische Hochschule Wien. In August 1944 he moved to Prague and worked as a lecturer at the Charles University. At the end of the war in May 1945 he was imprisoned, and he died in Czech custody in November 1945.
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