Bill Mackey (1906-1996) was a chemical engineer and the plant manager of the Technical Division of the Explosives Department of the E.I. du Pont de Nemours & Company. His papers consist of a mix of personal and DuPont Company materials documenting his career as an explosives expert.

Crawford H. Greenewalt (1902-1993) was an executive with the DuPont Company and president of the firm from 1948 to 1962. This collection consists of Greenewalt's papers from his time as president and chairman of the board. There is a broad range of external correspondence, internal company communications and reports, presidential working papers, transcripts of speeches, and published articles that make up the collection.

Crawford H. Greenewalt (1902-1993) was an executive with the DuPont Company and president of the firm from 1948 to 1962. In 1942, when the DuPont Company agreed to participate in the Manhattan Project, Greenewalt was named chief liaison, working with the physicists at the University of Chicago Metallurgical Laboratory, including Arthur Compton (1892-1962) and Enrico Fermi (1901-1954), who were developing techniques for plutonium separation. The collection consists of eight volumes of Greenewalt's diaries, which describe the history of the Manhattan Project and the development of the United States' first atomic bombs that were used to end the Second World War. The diaries describe the technical history of the project, as well as the relationships that developed between scientists.

Colonel Franklin T. Matthias (1908-1993) was commanding officer and area engineer of the Hanford Engineer Works of the Manhattan Engineer District. These are Colonel Matthias's personal papers documenting his work on the Manhattan Project. They include original declassified documents from Hanford and a variety of newspaper clippings and magazine articles collected by Matthias between the time he left Hanford to his death, reflecting his continuing interest in the Manhattan Project and nuclear power.

Franklin “Frank” T. Matthias (1908-1933) served as commanding officer and area engineer of Hanford Engineer Works from 1943 to 1945. He oversaw production of plutonium at Hanford to create the world’s first nuclear weapon, the atomic bomb. The bulk of the collection consists of photographs taken during the construction of the nuclear facilities at Hanford and the village of Richland in Washington state. Researchers interested in World War II, the Manhattan Project, industrial chemistry, nuclear energy, and company towns would find this collection useful.

Gilbert P. Church (1910-1993) was a civil engineer and the field project manager for E.I. du Pont de Nemours & Company at the Hanford Site during the Manhattan Project. His papers relate to the construction by DuPont for the United States government of the Hanford Engineer Works plutonium plant near Pasco, Washington.