Richard Feynman worked in Los Alamos, New Mexico, during the Manhattan Project.
In early 1943, Robert Oppenheimer was establishing the secret Los Alamos Laboratory on a mesa in New Mexico. Feynman joined the project after working with Robert R. Wilson’s team at Princeton on uranium-isotope separation. He traveled to New Mexico with other members of the Princeton group and was assigned to Hans Bethe’s Theoretical Division.
At Los Alamos, Feynman became a group leader and supervised human calculators performing large volumes of numerical work. With Nicholas Metropolis and others, he helped introduce IBM punched-card methods for computation. He also worked on neutron equations for the Water Boiler reactor and helped calculate the yield of a fission bomb with Bethe.
Los Alamos is sometimes confused with Albuquerque, Santa Fe, or Roswell because all are New Mexico locations connected in popular memory with wartime or atomic history. Albuquerque was nearby and important to Feynman personally, but his Manhattan Project laboratory was in Los Alamos.