Keywords: Szilard and Hilberry.jpg Dr Norman Hilberry left and Dr Leo Szilard stand beside the site where the world's first nuclear reactor was built during World War II Both worked with the late Dr Enrico Fermi in achieving the first self-sustaining chain reaction in nuclear energy on December 2 1942 at Stagg Field University of Chicago c undated http //www doedigitalarchive doe gov/ImageDetailView cfm ImageID 2017562 page search pageid thumb DOE Digital Archive Image 2017562 Stagg Field was demolished in 1957 so the picture was taken no later than that The plaque was added in December 1952 so no earlier than that Part of a series taken in August 1957 US Department of Energy PD-USGov People associated with the Manhattan Project Leó Szilárd Chicago Pile-1 Stagg Field Norman Hilberry |