Stefan Berger is Professor of Social History and Director of the Institute for Social Movements at Ruhr University Bochum, Germany. He is also Executive Chair of the Foundation History of the Ruhr and an Honorary Professor at Cardiff University in the UK. Together with Holger Nehring he has published The History of Social Movements in Global Perspective, (2017). Sean Scalmer is Associate Professor in the School of Historical and Philosophical Studies, University of Melbourne, Australia. His books include Gandhi in the West: The Mahatma and the Rise of Radical Protest, (2011) and On the Stump: Campaign Oratory and Democracy in the United States, Britain and Australia (2017).