Across the globe, schools are seen as an essential context for building socio-emotional capacities in adolescents, particularly for marginalized youth, who have been systematically and historically excluded from accessing opportunities and resources typically available to members of different social groups (Gil-Kashiwabara, Hogansen, Geenen, Powers, & Powers, 2007). However, despite this ideal, education has not yet reached its potential in promoting equal outcomes for all children andadolescents (American Psychological Association Presidential Task Force on Educational Disparities, 2012; Burkham & Lee, 2002; Gurria, 2016; Hampden-Thompson & Johnston, 2006). There exists a need to identify school practices that may enhance socio- emotional development and have implications for reducing disparities in academic achievement, educational attainment, and other indicators of well-being.

The aim of this dissertation, therefore, is to explore school and classroom practices that may be particularly effective in supporting the socio-emotional development of marginalized adolescents. I focus on two distinct populations: youth affected by violence in Colombia, and students of color within the United States. In Study 1, I explore whether three aspects of school climate – safety, connectedness, and services – buffer the negative implications of violence exposure for adolescent development in a Colombian sample. In Study 2, I determine how culturally responsive teaching practices in schools with high concentrations of students of color in the United States can be integrated into our current conceptualization of what constitutes high quality teaching, by examining profiles of teaching practices and associations between these profiles and teacher and classroom characteristics and student behaviors.

Early Childhood Education (ECE) classroom quality has been gaining increased attention from researchers and policy makers, as the link between high quality early learning experiences and future success has become clear. The impact of ECE may be particularly important for low-income, ethnic minority youth, who may need additional support to reach the academic level of their higher-income, Caucasian peers. However, the definition of ECE quality does not currently include indicators of classroom practices and center-wide policies that intentionally address issues of culture, race, and ethnicity, topics that may be particularly relevant for the most academically at-risk children. Anti-bias education (ABE) provides a strong theoretical and practical framework for understanding how to incorporate such themes into classroom practice and policy, as well as how to teach students to actively counteract bias and discrimination. However, there is currently no mechanism for researchers to utilize this framework, because there is no measure that can reliably evaluate the level of quality of ABE practices. Therefore, the present study sought to incorporate anti-bias education principles into the conceptualization of classroom quality through measurement development. The measure was developed based on the integration of the original ABE theory with interviews and observations in five ECE programs, which were nominated for their intentional practices regarding issues of culture, race, and ethnicity in the classroom. The five centers ranged in the ethnic composition and average income of their population. The resulting measure contains five domains, with a number of items within each domain. Two of the domains (Toys & Materials, Visual/Aesthetic Environment) contain observational rubrics for assessment, whereas the other three (Organizational Climate, Activities, Interactions) include self-report scales in addition to the rubrics. Future research is needed to pilot the measure and establish validity and reliability across contexts and observation times.