August Euler [SEP] country of citizenship
August Euler
August Euler (20 November 1868 – 1 July 1957) was a pioneer German aviator, aircraft constructor and the holder of the first Germany Pilots license, issued in 1909. After the First World War, he became German Secretary of State for Air, until he retired in 1922. 
Euler was born at Oelde in Westphalia and was educated at Oelde and at public schools in Cologne and Aachen and from 1885 started a career in engineering. He worked for Seidel & Neumann, originally a sewing machine company,
doctorate.
In 1899 Euler-Chelpin was appointed to teach Privatdozent in the Royal University at Stockholm where he began visiting the laboratory of van 't Hoff, one of the many who influenced Euler-Chelpin's interest in science along with Nernst.
In 1902 he took Swedish citizenship. Nevertheless, during the First World War, Euler-Chelpin took part in voluntary service in the German Air Force. During the Second World War, the professor worked in a diplomatic mission on the German side.
In 1906 he