Harold Fidler’s Interview
Harold Fidler was an Army major and a civil engineer for the Corps of Engineers. Fidler began working at the Radiation Laboratory at Berkeley with Ernest O. Lawrence in the early stages of the Manhattan Project. Fiddler was responsible for sending weekly reports on the progress that scientists were making to Colonel James C. Marshall, who oversaw the Manhattan Project during its initial stages. Fiddler also ensured that the laboratory received the materials that it needed. In his interview, he discusses what it was like to work under Lawrence, along with the secrecy surrounding the cyclotron and General Groves’ frequent visits.