Otto Hahn was a German chemist and Nobelist who won the 1944 Nobel Prize in Chemistry for his discovery of nuclear fission. He is widely regarded as one of the most significant chemists of the 20th century. Hahn was born in Frankfurt am Main, Germany in 1879 and studied chemistry at the University of Marburg. He worked in various research laboratories throughout his career, including the Kaiser Wilhelm Institute for Chemistry in Berlin. His work on nuclear fission revolutionized the field of nuclear physics and led to the development of nuclear energy.