Graham Richards retired from his posts as Director of the British Psychological Society's History of Psychology Centre and Professor of History of Psychology at Staffordshire University in 2006. His previous publications include Human Evolution: An Introduction for the Behavioral Sciences (2nd ed., 2020), Psychology: The Key Concepts (2008), 'Race', Racism and Psychology: Towards a Reflexive History (2nd ed., 2011), On Psychological Language (1989) and Creationism: Design Errors and Cross-Purposes (2014).

Paul Stenner is a Professor of Social Psychology at the School of Psychology and Counselling at the Open University, UK. He is Past President of the International Society for Theoretical Psychology and a Fellow of the Academy for Social Science and of the Alexander von Humboldt Stiftung. His recent books include Liminality and Experience: A Transdisciplinary Approach to the Psychosocial (2017), Doing Q Methodological Research: Theory, Method and Interpretation (2012, with S. Watts) and Psychology without Foundations: History, Philosophy and Psychosocial Theory (2009, with S. Brown).