National Museum of Nuclear Science & History
John Myers worked for the Roane-Anderson Company.
Seymour Calvert served for 11 months in the Special Engineering Detachment at Los Alamos. He specialized as a chemical engineer, and carried out experiments with beryllium that were often dangerous.
Originally from California, Jean Crossland was a secretary in the K-25 process area at Oak Ridge during the Manhattan Project.
Hilgeman worked at the 100-D Area at Hanford during the Manhattan Project.
