George R. Holdren

Forrest Waldrop

Waldrop arrived at Oak Ridge in early 1944, directly after receiving his Army basic training. At Oak Ridge, he worked at the Y-12 plant during the Manhattan Project.

R. Donaldson

Leandro S. Ortiz

Leandro Ortiz was a staff worker at Los Alamos during the Manhattan Project.

Helena Calloway

Helena Calloway was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.