Leona Aiken is President’s Emeritus Professor of Psychology at Arizona State University and founding chair of its Ph.D. concentration in Quantitative Methods in Psychology. Her research bridges methodology and substance, focusing on models involving continuous variable interactions and on women’s health protective behavior across the lifespan. She co-authored Multiple Regression: Testing and Interpreting Interactions and Applied Multiple Regression/Correlation Analysis for the Behavioral Sciences (3rd ed.). Aiken is a past president of SMEP, the Western Psychological Association, and APA’s Division of Evaluation, Measurement, and Statistics.