People of Los Alamos

Black and white photo of four people in uniforms on a deck.
Los Alamos service members, 1945.


The isolated desert region of Los Alamos, New Mexico served as the site for top-secret atomic bomb research and development. Approved by General Leslie Groves on November 25, 1942 and headed by physicist J. Robert Oppenheimer, Los Alamos saw hundreds of scientists and engineers work together to develop the Gadget, the world’s first nuclear test device, Little Boy, the uranium-fueled atomic bomb dropped on Hiroshima, Japan, and Fat Man, the plutonium-fueled atomic bomb dropped on Nagasaki, Japan. Learn more about the key players and lasting legacies at this secret community that forever changed the world. 
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    Last updated: April 5, 2023

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    Contact Info

    Mailing Address:

    Manhattan Project National Historical Park
    c/o NPS Intermountain Regional Office
    P.O. Box 25287

    Denver, CO 80225-0287


    Hanford: 509.376.1647
    Los Alamos: 505.661.6277
    Oak Ridge: 865.482.1942

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