Andrew F. Hayes, PhD, is Distinguished Research Professor at the Haskayne School of Business, University of Calgary, Alberta, Canada, where he is also affiliated with the Department of Psychology. His research and writing on data analysis has been published widely. Dr. Hayes is author or coauthor of books including Introduction to Mediation, Moderation, and Conditional Process Analysis, Third Edition, and Regression Analysis and Linear Models, Second Edition. A Fellow of the Association for Psychological Science and a recipient of the Methodological Innovator Award from the Society for Personality and Social Psychology, he has been recognized year after year as a Clarivate Analytics Highly Cited Researcher. Dr. Hayes teaches data analysis at the University of Calgary, including regression analysis and various other multivariate analysis courses, and conducts workshops on statistical analysis online and in person throughout the world. His website is www.afhayes.com.

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Richard B. Darlington, PhD, is Emeritus Professor of Psychology at Cornell University. Dr. Darlington is a Fellow of the American Association for the Advancement of Science. He has published most extensively on regression and related methods, the cultural bias of mental tests, the long-term effects of preschool programs, and, most recently, the neuroscience of brain development and evolution.

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