Kacper Stanisław Leśniewski received his BA in History from the Cardinal Stefan Wyszynski University in 2021 with a thesis titled Polish-Slovak Relations in 1939. In July 2023, he earned his MA for his dissertation Polish Relations with Selected African States in the Years 1918–1945. From 2023 to 2025, he worked at the Archive of the Institute of National Remembrance, and in October 2026, he joined the Pilecki Institute.

Research/academic interests

• history of the interwar period;
• international relations;
• historical disinformation.

Awards and honors

• Second-degree award for the best master’s thesis in history written in the 2022/2023 academic year at the Faculty of Historical Sciences, Cardinal Stefan Wyszynski University in Warsaw.