- Fonds consists of records created and accumulated by Geoffrey Arthur Holland Pearson throughout his personal and professional life. The fonds is comprised of two series: Lester B. Pearson and Geoffrey Pearson. The first series is comprised of material created by or pertaining to Lester B. Pearson. The series contains correspondence created by or received by Lester B. Pearson. The correspondence is arranged in four sub-series: Lester B. Pearson to Parents and Family; Lester B. Pearson to Maryon Pearson; Lester B. Pearson and Geoffrey A.H. Pearson; and Lester B. Pearson and William Spencer. This series also contains two scrapbooks.
- The second series is subdivided into the following areas: Geoffrey Pearson and Lester B. Pearson; United Nations; Soviet Union and Russia; Material on India; Arms Control and Disarmament; Foreign Policy; Global/Future trends; Nuclear Arms; Diplomacy and Diplomats; Peacekeeping; Canadian Institute for International Peace; Miscellaneous Material; and Subject Files, Papers, and Reports.