National Museum of Nuclear Science & History
A. W. Seivert worked for Hanley & Company.
Cathcart worked at the 200 East Area at Hanford during the Manhattan Project.
Haskell Sheinberg arrived at Los Alamos in late 1944 as part of the Special Engineer Detachment. Sheinberg’s first assignment was to purify plutonium under the direction of Arthur Wahl, one of the co-discoverers of plutonium.
