Scott T. Walters, PhD, is Regents Professor in the School of Public Health at the University of North Texas Health Science Center. His research focuses on the use of motivational interviewing and other brief interventions to help people make changes in substance abuse and other problem behaviors. Widely published, Dr. Walters has acted as a consultant for several agencies; is a frequent speaker to university, community, and medical groups; and has received national and international awards for his work integrating research and practice.

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Frederick Rotgers, PsyD, ABPP, is Director of the Program for Motivation and Change at the Graduate School of Applied and Professional Psychology, Rutgers, The State University of New Jersey, and a psychologist in independent practice. He is a Fellow of the American Psychological Association (APA), is a past president of the Society of Addiction Psychology (APA Division 50), and is certified in clinical and cognitive and behavioral psychology by the American Board of Professional Psychology. The author or editor of numerous books on the assessment and treatment of substance use disorders, Dr. Rotgers is American Editor-in-Chief of the journal Addiction Research and Theory.