 In February 1943, Warren met with Dr Albert K. Chapman, the Vice President and General Manager of Eastman Kodak, Brigadier General Leslie R. Groves, the director of the Manhattan Project and Colonel James C. Marshall, the commander of the Manhattan Engineer District (MED). They asked him about his work with radiation and isotopes and asked Warren to become a civilian consultant for the MED. In March 1943, Warren met with Major Hymer L. Friedell at the MED's New York City headquarters. Friedell had joined the Metallurgical Laboratory in August 1942 from the University of California, Berkeley, where he had been involved in radiology research under Dr Robert S. Stone. Friedell requested information about safety matters involving radiation. Warren was unable to provide all the information, but agreed to initiate research at Rochester.
