Memorializes Jim Sidanius (née James Brown [1945-2021]), one of the the foremost social and political psychologists of his generation. His theory of social dominance redefined the scientific study of intergroup relations, advancing novel hypotheses regarding the causes and consequences of intergroup conflict and inequality by integrating insights across the social and biological sciences. Jim's theoretical insights were matched only by his empirical prowess; he was a master at analyzing large data sets with advanced statistical methods, methods that he taught to hundreds of doctoral students over the years in his notoriously challenging but rewarding graduate statistics courses at the University of California, Los Angeles (UCLA), and Harvard. Beyond his teaching of statistics and advanced topics in social psychology and African American studies, Jim mentored dozens of aspiring intergroup relations scholars over a 44-year career. As one of few Black social psychologists, he served as a role model for young Black scholars in particular. (PsycInfo Database Record (c) 2022 APA, all rights reserved).