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. Miller'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 67 books and over 450 articles and chapters. His website is https://williamrmiller.net.

Ricardo F. Muñoz, PhD, is Professor Emeritus of Psychology at the University of California, San Francisco, and Distinguished Professor Emeritus at Palo Alto University. He was also Adjunct Clinical Professor at Stanford University, and on the affiliated faculty in the Department of Psychology at the University of California, Berkeley. Dr. Muñoz was inducted as a Fellow of the American Association for the Advancement of Science in recognition of his distinguished contributions to the treatment and prevention of depression and the development of internet interventions to improve mental health worldwide.