Quincannon Pub Group, 2020. External links Hammond Castle Museum Official Website John Hays Hammond, Jr. papers (MS 863). Manuscripts and Archives, Yale University Library. The Infography of John Hays Hammond Jr. Biography of John Hays Hammond Jr. 1941 Illustrated Story of John Hammond Jr. 1888 births 1965 deaths People from San Francisco IEEE Medal of Honor recipients Yale School of Engineering & Applied Science alumni People from Gloucester, Massachusetts 20th-century American inventors