Stephen has written/edited over 50 books including the Handbook of Counselling, Handbook of Coaching Psychology, Cognitive Behavioural Coaching in Practice, Brief Cognitive Behaviour Therapy, Developmental Coaching, The Coaching Relationship and Solution Focused Coaching in Practice. He developed the PRACTICE model of coaching and counselling. He is Professor of Practice at the University of Wales Trinity Saint David. In his spare time, he produces 10 webradio stations.

Albert Ellis was an American psychologist who in 1955 developed Rational Emotive Behavior Therapy (REBT). He held M.A. and Ph.D. degrees in clinical psychology from Columbia University and American Board of Professional Psychology (ABPP). He also founded and was the President of the New York City-based Albert Ellis Institute for decades. He is generally considered to be one of the originators of the cognitive revolutionary paradigm shift in psychotherapy and the founder of cognitive-behavioral therapies. Based on a 1982 professional survey of USA and Canadian psychologists, he was considered as the second most influential psychotherapist in history (Carl Rogers ranked first in the survey; Sigmund Freud was ranked third).