William R. Miller, PhD (Clinical Psychology) is Emeritus Distinguished Professor of Psychology and Psychiatry at the University of New Mexico. He has published over 400 professional articles and chapters and 65 books including On Second Thought: How Ambivalence Shapes Your Life (2022), Effective Psychotherapists: Clinical Skills that Improve Client Outcomes (2021), Treating Addiction (2019), and Motivational Interviewing (4th edition, 2023). The Institute for Scientific Information has listed him among the world’s most cited scientists.