Hendrik Kloosterman

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Hendrik Douwe Kloosterman (09 April 1900, Rottevalle, Friesland - 06 May 1968, Leiden) was a Dutch mathematician, known best for introducing Kloosterman sums. After completing his master's degree in Leiden from 1918-1922, he studied in Copenhagen with Harald Bohr and in Oxford with G. H. Hardy. In 1924 he received his PhD in Leiden under supervision of J. C. Kluyver. From 1926 to 1928 he studied in Göttingen and Hamburg, and he was assistant in Münster from 1928-1930. Kloosterman was appointed lector in Leiden in 1930 and full professor in 1947. In 1950 he was elected a member of the Koninklijke Nederlandse Akademie van Wetenschappen.