George B. Dewitt

Leonard Pieczontka

Melvin A. Miller

Melvin A. Miller was a draftsman at the University of Chicago Met Lab. In 1946, he sketched two famous drawings of Chicago Pile-1 based on the descriptions of scientists who were present when it went critical.

A. S. Preston

A. S. Preston worked for the Tennessee Eastman Corporation at the Y-12 Plant.

Majorie B. Bliss

Majorie Bliss was a stenographer at the Metallurgical Laboratory in Chicago during the Manhattan Project.