Reinhold Strassmann (or Straßmann) (24 January 1893 Berlin – late October 1944 Auschwitz concentration camp) was a German mathematician who proved Strassmann's theorem. His Ph.D. advisor at University of Marburg was Kurt Hensel.Strassmann refused to leave Nazi Germany, and he was eventually detained and deported to Theresienstadt concentration camp in 1943.