John L. O’Gara

Anthony J. Matz

Anthony J. (“Tony”) Matz was a procurement officer at the University of Chicago Met Lab. He helped obtain, handle, and move many of the materials for Chicago Pile-1 and witnessed it going critical on December 2, 1942.

Paul Raymond Nelson

Paul Raymond Nelson was born in Hagerman, Idaho on May 31st, 1916. Soon after, he moved to Olympia, Washington and then to Seattle.

Leon O. Jacobson

Leon O. Jacobson was Associate Director of the Health Division and Section Chief of H-I, Clinical Medicine and Medical Research, at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

John A. White