Hans von Euler-Chelpin, German-Swiss biochemist and academic, Nobel Prize laureate (b. 1863)
Hans Karl August Simon von Euler-Chelpin (15 February 1873 – 7 November 1964) was a German-born Swedish biochemist. He won the Nobel Prize in Chemistry in 1929 with Arthur Harden for their investigations on the fermentation of sugar and enzymes. He was a professor of general and organic chemistry at Stockholm University (1906–1941) and the director of its Institute for organic-chemical research (1938–1948). Euler-Chelpin married chemist Astrid Cleve, the daughter of the Uppsala chemist Per Teodor Cleve and was distantly related to Leonhard Euler. In 1970, their son Ulf von Euler, was awarded the Nobel Prize in Physiology or Medicine.