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York was hardly a ‘leading scientist’ at the Manhattan Project, since he only had just gotten his MS when he was there.
http://en.wikipedia.org/wiki/Richard_Feynman
...As a junior physicist, he was not central to the project. The greater part of his work was administering the computation group of human computers in the Theoretical division (one of his students there, John G. Kemeny, would later go on to co-write the computer language BASIC). Later, with Nicholas Metropolis, he assisted in establishing the system for using IBM punch cards for computation. Feynman succeeded in solving one of the equations for the project that were posted on the blackboards. However, they did not “do the physics right” and Feynman’s solution was not used in the project. Feynman’s other work at Los Alamos included calculating neutron equations for the Los Alamos “Water Boiler”, a small nuclear reactor, to measure how close an assembly of fissile material was to criticality. On completing this work he was transferred to the Oak Ridge facility, where he aided engineers in devising safety procedures for material storage so that inadvertent criticality accidents (for example, storing sub-critical amounts of fissile material in proximity on opposite sides of a wall) could be avoided. He also did theoretical work and calculations on the proposed uranium-hydride bomb, which later proved not to be feasible. Feynman was sought out by physicist Niels Bohr for one-on-one discussions. He later discovered the reason: most physicists were too in awe of Bohr to argue with him. Feynman had no such inhibitions, vigorously pointing out anything he considered to be flawed in Bohr’s thinking...