Homer M. O’Callaghan

P. R. Jernigan

Jernigan worked for Stone and Webster Engineering Corporation.

Alfred Simon

Alfred Simon was a research associate at the Metallurgical Laboratory in Chicago during the Manhattan Project.

Otto Frisch

Otto Frisch (1904-1979) was an Austrian-born physicist.  Frisch joined the Manhattan Project in 1943, but his most important contribution to the project came in 1940 in England.

J. D. Bullington