S Alexander Haslam (Alex Haslam) is Professor of Psychology and Australian Laureate Fellow at the University of Queensland. Together with colleagues, he has written and edited 15 books and over 300 research articles and chapters. His most recent books are The New Psychology of Leadership: Identity, Influence and Power (with Steve Reicher and Michael Platow, 2nd ed. 2020) and Social Psychology: Revisiting the Classic Studies (edited with Joanne Smith, 2nd ed. 2017). He is former Chief Editor of the European Journal of Social Psychology and former President of the Psychology Section of the British Science Association. He is a recipient of the European Association of Social Psychology’s Kurt Lewin Medal for research excellence, and the International Society of Political Psychology’s Nevitt Sanford Award for contributions to political psychology. He has also received awards for distinguished contributions to psychological science from both the British Psychology Society and the Australian Psychology Society. In 2022 he was appointed a Member of the Order of Australia “for significant service to higher education, particularly psychology, through research and mentoring”. Katrien Fransenis an Assistant Professor of Performance Psychology at the Department of Movement Sciences at KU Leuven. Her research focuses on how shared leadership can benefit sport team effectiveness and athlete well-being, with a particular emphasis on the role of social identity processes. Filip Boen is Professor of Sport and Exercise Psychology and Head of Department at KU Leuven. His research focuses on the psychology of sports fans and on the ways in which this is shaped by, and shapes, team-based social identities.