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I study the intellectual, social and institutional dynamics of educational systems like schools, classrooms, universities and disciplines. I have performed a series of studies on classroom organization and interaction; on the formation of adolescent relationships, social structures, and identities; on interdisciplinary collaboration and intellectual innovation; and on the form, dynamics and innovation of scientific fields. I have broad research interests and have been drawn into a variety of interdisciplinary collaborations with linguists, computer scientists, and sociologists. This in turn has led to studies of big data and methodological advances in social networks, language modeling and the study of innovation.