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'''Otto Hahn''' ({{IPA|de|ˈɔtoː ˈhaːn|pron|De-Otto Hahn.ogg}}; 8 March 1879 – 28 July 1968) was a German [[chemist]] who was a pioneer in the fields of [[radioactivity]] and [[radiochemistry]]. He is referred to as the father of [[nuclear chemistry]] and discoverer of [[nuclear fission]], the science behind [[nuclear reactor]]s and [[nuclear weapon]]s. Hahn
A graduate of the [[University of Marburg]], which awarded him a doctorate in 1901, Hahn studied under Sir [[William Ramsay]] at [[University College London]] and at [[McGill University]] in Montreal under [[Ernest Rutherford]], where he discovered several new radioactive isotopes. He returned to Germany in 1906; [[Emil Fischer]] let him use a former woodworking shop in the basement of the Chemical Institute at the [[University of Berlin]] as a laboratory. Hahn completed his [[habilitation]] in early 1907 and became a ''[[Privatdozent]]''. In 1912, he became head of the Radioactivity Department of the newly founded [[Kaiser Wilhelm Institute for Chemistry]] (KWIC). Working with the Austrian physicist Lise Meitner in the building that now bears their names, they made a series of groundbreaking discoveries, culminating with her isolation of the longest-lived isotope of protactinium in 1918.
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