Otto Hahn was a German chemist born in 1879, renowned for his pioneering work in radiochemistry. He is best known for the discovery of nuclear fission in 1938, alongside Fritz Strassmann, a breakthrough that significantly contributed to the development of nuclear energy and atomic weapons. Hahn was awarded the Nobel Prize in Chemistry in 1944 for this discovery. Throughout his career, he was a key figure in advancing the understanding of radioactivity and transuranium elements.