My primary research interests include (1) intergroup relations, (2) social dilemmas, (3) group decision making, and (4) social identity. In the area of intergroup relations I’m especially interested in determining how social situational and person variables interact to determine expressions of prejudice, stereotyping, and discrimination. My research on social dilemmas examines how people react when their personal goals conflict with the goals of a group to which they belong. I’m also examining the situational factors and intragroup processes that influence the quality of group decisions. Finally, I have a strong interest in understanding the structure, determinants, and consequences of social identity, that part of the self-concept that is derived from one's group memberships.