This fonds consists of records, accumulated by Diamond during his career, that reflect his activities in various roles primarily from 1955 to 1990. Items include correspondence, notes, drafts, reports, and other records related to his work in the Economic Development Institute (EDI), the International Finance Corporation (IFC), the Development Finance Companies department, the South Asia Regional Vice-Presidency (SARVP), and others. The fonds also contains records related to speeches and memoirs he authored.