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National Museum of Nuclear Science & History

Related Profiles

Karl D. Larsen

Chicago, IL

Dr. Karl Larsen worked at Massachusetts Institute of Technology during the Manahattan Project. While there, he conducted heavy-water research by spectrum analysis, which was one of the prerequisites to the early atomic bombs.

Hazel V. Hammond

X-10 Graphite Reactor

Hazel Hammond worked for Clinton Laboratories at the X-10 Reactor.

Gordon Rolph

Hanford, WA

Helena Calloway

Chicago, IL

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