Stanley O. Gaines, Jr. is a social psychologist who studies individual differences in social behavior, especially within close relationships. He has received funding from the Ford Foundation, the American Psychological Foundation, the Fulbright Association, the Society for the Psychological Study of Social Issues, and the Economic and Social Research Council. He is President of the International Association for Relationship Research (IARR) and won the 2018 IARR Book Award for Personality and Close Relationship Processes. He has written three additional books, and 100+ articles and book chapters, primarily within the field of relationship science.