Lise Meitner (7 November 1878 – 27 October 1968) was an Austrian physicist who worked on radioactivity and nuclear physics. Meitner was part of the Hahn-Meitner-Strassmann team that worked on "transuranium-elements" from 1935 onward, which led to the radiochemical discovery of the nuclear fission of uranium and thorium in December 1938, an achievement for which her colleague Otto Hahn was awarded the Nobel Prize for Chemistry in 1944.