Jürgen Mackert is Professor of Sociology and co-director of the 'Centre for Citizenship, Social Pluralism and Religious Diversity' at Potsdam University, Germany. His research interests include sociology of citizenship, political economy, closure theory, and collective violence. Recent publication: Social life as collective struggle: Closure theory and the problem of solidarity, SOZIALPOLITIK.CH (2021).

Hannah Wolf is a Researcher and Lecturer at the Chair for General Sociology at the University of Potsdam, and associate member at the DFG-collaborative research centre 'Re-Figuration of Spaces'. Her research interests include urban sociology, theories of space and place, and citizenship studies. Latest publication: Am Ende der Globalisierung: Über die Refiguration von Räumen (ed. with Martina Löw, Volkan Sayman and Jona Schwerer), 2021, transcript.

Bryan S. Turner is Research Professor of Sociology at the Australian Catholic University (Sydney), Emeritus Professor at the Graduate Center CUNY, Honorary Max Planck Professor at Potsdam University, Germany, and Research Fellow at the Edward Cadbury Center, University of Birmingham, UK. He holds a Cambridge Litt.D. In 2020 with Rob Stones he published 'Successful Societies: Decision-making and the quality of attentiveness', British Journal of Sociology, 71(1), 183-202.