Hans von Euler-Chelpin

Born in Germany in 1873, Hans von Euler-Chelpin moved to Sweden and built a career decoding the chemistry of life's simplest processes. At Stockholm University, where he taught from 1906 to 1941, he investigated fermentation and enzymes alongside Arthur Harden — work that earned them the 1929 Nobel Prize in Chemistry. He married Astrid Cleve, herself a chemist and the daughter of Uppsala's Per Teodor Cleve, binding two scientific lineages. He directed Stockholm's Institute for organic-chemical research until 1948, a decade-long twilight to a long experimental life. In 1970, six years after his…