Stephen Rollnick, PhD, is Honorary Distinguished Professor in the School of Medicine at Cardiff University, Wales, United Kingdom. He is cofounder of motivational interviewing, with a career in clinical psychology and academia that focused on how to improve conversations about change, and helped to create the Motivational Interviewing Network of Trainers (https://motivationalinterviewing.org). He has worked in diverse fields, with special interests in mental health and long-term health conditions like diabetes, heart disease, and HIV/AIDS. Dr. Rollnick has published widely in scientific journals and has written many books on helping people to change behavior. He is coauthor (with William R. Miller) of the classic work Motivational Interviewing: Helping People Change, now in its third edition. He has traveled worldwide to train practitioners in many settings and cultures, and now works as a trainer and consultant in health care and sports. His website is www.stephenrollnick.com. 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 65 books and over 400 articles and chapters. His website is https://williamrmiller.net. Christopher C. Butler, MD, is Professor of Primary Care at the Nuffield Department of Primary Care Health Sciences, University of Oxford, United Kingdom, and Professorial Fellow at Trinity College. He is Clinical Director of the University of Oxford Primary Care Clinical Trials Unit, and chairs the Longitude Prize Advisory Panel. Dr. Butler was for many years a general practitioner in South Wales. He was named the Wales Royal College of General Practitioners patient-nominated GP of the Year in 2019 and received the Royal College of General Practitioners Research Paper of the Year Award in 2020. His main research interests are in common infections, and health care communication and behavior change. He has led, or helped lead, over 30 clinical trials and published over 400 peer-reviewed papers.