Steven O'Connor is Lecturer in British History and Institutions at Sorbonne University, Paris, France. His research focuses on coalition warfare, 1914-1945, the integration of non-British soldiers in the British army and Irish military history. He previously published Irish Officers in the British Forces, 1922-45 (2014).

Guillaume Piketty is Full Professor in History at Sciences Po, Paris, France. His research focuses on the social and cultural history of World War II in France and Europe, and, more broadly, on war, resistance, coming out of war and society since the beginning of the US Civil War.