Mick Cooper, DPhil, CPsychol, is Professor of Counselling Psychology at the University of Roehampton, London, United Kingdom. Dr. Cooper is author or editor of a range of texts on person-centered, existential, and relational approaches to therapy, and co-developed the pluralistic approach with John McLeod. He received the Carmi Harari Mid-Career Award from Division 32 (Society for Humanistic Psychology) of the American Psychological Association and is a Fellow of the British Association for Counselling and Psychotherapy and the Academy of Social Sciences.

William R. Miller, PhD, is Emeritus Distinguished Professor of Psychology and Psychiatry at the University of New Mexico. He introduced motivational interviewing in a 1983 article and in the first edition of Motivational Interviewing (1991), coauthored with Stephen Rollnick. Dr. MillerâEUR(TM)s research has focused particularly on the treatment and prevention of addictions and more broadly on the psychology of change. He is a recipient of two career achievement awards from the American Psychological Association, the international Jellinek Memorial Award, and an Innovators Award from the Robert Wood Johnson Foundation, among many other honors. His publications include dozens of books and over 450 articles and chapters. His website is https://williamrmiller.net.