He is also a faculty member in the Joint Ph.D. Program in Social Policy and Sociology, and a Faculty Associate of the Office of Population Research, the Center for Research on Child Wellbeing, and Center for Migration and Development at Princeton University. Harris' research interests include social inequality, policy, and education. His work focuses on the social psychological determinants of the racial achievement gap. Specifically, he examines the factors that contribute to differences in academic investment among African Americans, Latino/as, Asian Americans, and Whites. Harris also studies the impact that adolescents' perceptions of opportunities for upward socio-economic mobility have for their academic investment, and the long-term effects of youths' occupational aspirations both within the United States and Europe.