David Hawkins served as an administrative aide at the Los Alamos Laboratory in 1943 and as the Manhattan Project’s historian in 1945-46. In that role, he had free access to all the top people involved, including project director J. Robert Oppenheimer and physicist Edward Teller. In this interview, he discusses the nature of Communist activity among the intellectual community in Berkeley California—a community that included a number of future Manhattan Project scientists. He describes his experiences working directly under Oppenheimer during his stint at Los Alamos, noting his charisma as well as his hubris. He describes that work; the copious and all-encompassing research that was required from his position as project historian. Finally, he concludes by discussing the years after the war, and his and his wife’s relationships with Clifford and Virginia Durr.