The heterogeneity of family firms and their simultaneous pursuit of financial and nonfinancial goals is well established in the literature. However, causal factors underlying the variance in the goals, behaviors, and performance of family firms remain unclear. To help fill this gap, the articles in this special issue point to psychological aspects of individuals and families that underpin family firm behaviors and outcomes. Building on the theme of psychological influences, this introductory article discusses how the integration of five areas of psychology can accelerate our understanding of the causes and consequences of individual and group behaviors in family firms.