Oskar Klein (1894-1977). Born in Mörby, Sweden. After
work with Arrhenius in physical chemistry, he met Kramers, then a
student of Bohr, in 1917. Klein worked with Bohr in the field of
molecular physics and received his doctorate in 1921 at Stockholm
Högskola. His first research position was at the University of
Michigan in Ann Arbor, where he worked on the Zeeman effect. Back
in Europe from 1925, he taught at Lund University and tried to
connect Kaluza’s work with quantum theory. In 1930 he became
professor for mathematical physics at Stockholm Högskola until
retirement. His later work included quantum theory (Klein-Nishina
formula), superconductivity, and cosmology.