Nicky Hayes is a well-known psychologist, writer and consultant. She is the Editor of Testing International, the newsletter of the International Test Commission, is actively involved in the British Psychological Society, and, at the time of publication, she is the President-Elect of the BPS. She is a Fellow of the British Psychological Society, an Honorary Life Member of the Association of the Teaching of Psychology and a recipient of the BPS Award for Distinguished Contributions to the Teaching of Psychology.

Peter Stratton is an Emeritus Professor at the University of Leeds, UK. Following a distinguished career in developmental psychology, his work in child protection led him to move into systemic family therapy and he became a founder and director of the Leeds Family Therapy and Research Centre.