National Museum of Nuclear Science & History
Hans von Halban (1908-1964) was an Austrian born French physicist. He finished his studies in 1934. He joined nuclear physicist Niels Bohr in Copenhagen, where he and Otto Frisch discovered that heavy water had very little neutron absorption compared to normal water.
Millard Ross was a staff worker at Los Alamos during the Manhattan Project.
Seymour worked at the 200 West Area at Hanford during the Manhattan Project.