Pierre Curie (May 15, 1859—April 19, 1906) was French pioneer in physics. He specialized in crystallography, magnetism, piezoelectricity, and radioactivity. With his wife Marie Sklodowska-Curie and Henri Becquerel, he won a Nobel Prize in Physics. He is credited to the discovery of nuclear energy. The Radiology Congress named the unit that measures radioactivity "curie" in honor of Pierre Curie's work in the field.