Professor Stewart is a social psychologist studying intergroup relations in the contexts of gender, race and ethnicity, nationality, sexual orientation, and class. His research examines (a) how widespread beliefs about social groups contribute to intergroup violence and discrimination and (b) how to change those beliefs in order to reduce violence and discrimination. For example, Stewart’s research has examined how sexist and hegemonic masculinity norms contribute to violence and discrimination against women in both experimental and archival studies of international data. In addition to understanding how norms relate to intergroup violence and discrimination, he has studied why people engage in collective action and protest in order to reduce violence, discrimination, and inequality. This research has been examined why men and women engage in collective action to reduce gender inequality, and also why international observers protested in support of the Arab uprisings in 2010-2011. Finally, he has administered and evaluated a sexual assault prevention program for college men in order to reduce sexual violence and has consulted with universities and non-profit organizations on men’s programming and violence prevention training sessions for practitioners and community members. Professor Stewart also has a strong interest in advanced statistical methods, including multilevel modeling, structural equation modeling, and dyadic and group data analyses.