Felix Römer is a research fellow in modern history at the German Historical Institute London. He has published widely on the history of National Socialism, the Third Reich and its military, and the Second World War. His book publications include Der Kommissarbefehl: Wehrmacht und NS-Verbrechen an der Ostfront (2008), Kameraden: Die Wehrmacht von innen (2012), and Die narzisstische Volksgemeinschaft: Theodor Habichts Kampf 1914 bis 1944 (2017).

Alex J. Kay is Senior Lecturer in the Department of History at the University of Potsdam and Fellow of the Royal Historical Society. From 2014 to 2016, he was Senior Academic Project Coordinator at the Institute of Contemporary History Munich-Berlin (IfZ). He is the author of The Making of an SS Killer: The Life of Colonel Alfred Filbert, 1905-1990 (2016) and Exploitation, Resettlement, Mass Murder: Political and Economic Planning for German Occupation Policy in the Soviet Union, 1940-1941 (2006). He is co-translator of Under Observation: Austria since 1918 (2018) and The First World War and the End of the Habsburg Monarchy, 1914-1918 (2014).