Paul Ulrich Villard (28 September 1860 – 13 January 1934) was a French chemist and physicist, born in Saint-Germain-au-Mont-d'Or, Rhône, 28 September 1860. He discovered gamma rays in 1900 while studying the radiation emanating from radium.
Read more about Paul Ulrich Villard: Early Research, Discovery of Gamma Rays, Later Work, Retirement and Death