Stefan Berger is Professor of Social History and Director of the Institute for Social Movements at Ruhr University Bochum, Germany. He is Executive Chair of the Foundation History of the Ruhr and an Honorary Professor at Cardiff University.

Klaus Weinhauer is Professor of Modern History at Bielefeld University, Germany. His research explores transnational and comparative history, with a special focus on labour history, urban violence, security, policing, and juvenile delinquency.