German Chemist who discovered nuclear fission (1939). Pioneering scientist in the field of radio-chemistry. Discovered radio-active elements and nuclear isomerism (1921). Awarded Nobel Prize for Chemistry (1944). Hahn was born in Frankfurt, Germany, in 1879 to a rich entrepreneur named Heinrich Hahn. Otto Hahn joined the Kaiser Wilhelm Society (KWG) in 1946. He was the last president of the institution. Hahn was also founding president of the Max Planck Society (MPG), where performed his duties from 1948 to 1960.Hahn died on July 28, 1968. He was 89 years old.