Dr John Coleman O.B.E. is Founder of the Trust for the Study of Adolescence. He has written widely in this field, and is the former editor of the Journal of Adolescence. He is a Senior Research Fellow in the Department of Educational Studies, University of Oxford.

Professor Leo B. Hendry is a Fellow of the British Psychological Society, Emeritus Professor, University of Aberdeen, and Research Professor in Psychology at the Centre for Lifespan Research, University of Glamorgan, Wales.

Professor Marion Kloep is Professor of Psychology at the Centre for Lifespan Research, University of Glamorgan, Wales.

All three have published numerous books and research papers in the field of adolescence.