National Museum of Nuclear Science & History
H. J. Ratjen worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Fred Vaslow, a physical chemist, began working on the Manhattan Project while a graduate student at the University of Chicago.
John Ryan was a staff worker at Los Alamos during the Manhattan Project.
Warren Sheehan joined Mound Laboratory in April 1956. He spent the first half of his career in health physics, or radiation safety, where he developed a new methodology for determining the amount of plutonium in urine.
