“Frank Knox: Roughrider in FDR’s War Cabinet, a biography based primarily on Knox’s papers. The book provides a detailed account of Knox’s life and career and context for his achievements. O’Sullivan makes the case that Knox deserves to be included with Stimson and Marshall as one of the principal architects of the Allied victory in World War II.” (Mary Jo Binker, H-Diplo, H-Net Reviews, October 23, 2024)