Drawing from the National Center for Early Development and Learning (NCEDL) Multi-State Study of Prekindergarten and the State-Wide Early Education Programs Study (SWEEP), this study examined the effects of classroom and teacher variables on social-emotional development in prekindergarten. Results indicated that prekindergarten teachers rated males significantly higher in behavioral problems and lower in social competence than females. However, when teacher-child ethnic match was taken into consideration these differences were not present. In contrast to existing evidence, African American males in particular were no more likely to have teachers who report behavior problems than their Latino and White male peers. Implications for the prevention of behavioral problems are discussed. (Contains 5 tables.)