Franco Dino Rasetti (August 10, 1901 – December 5, 2001) was an Italian (later naturalized American) physicist, paleontologist and botanist. Together with Enrico Fermi, he discovered key processes leading to nuclear fission. Rasetti refused to work on the Manhattan Project on moral grounds.
Raymond K. Sheline (March 31, 1922 – February 10, 2016) was a member of the Manhattan Project and spent much of his career as a professor in chemistry and physics at Florida State University. Sheline's research focused on spectroscopic studies of atomic nuclei and molecular structures.
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium.