His substantive interests include the study of schools as organizations, how teachers influence one another to affect classroom practices and school decision-making, social networks, and the social context of learning. His substantive areas are linked to several methodological interests: social network analysis, hierarchical linear modeling, cluster analysis, multidimensional scaling, log-linear and logit models, simultaneous equation models and time series models. His publications include new quantitative methods for representing relations among teachers and how those relations affect teachers’ orientations to teaching, the characteristics of schools, which affect teachers’ orientations to teaching, and ways in which actors generate social capital from their social relations.