Joscha Legewie is professor of sociology at Harvard University. Legewie examines how peer groups, schools, neighborhoods, and the sequencing of events produce macro patterns of social inequality and influence the relations between social groups. His work is motivated by a theoretical interest in the social, spatial, and temporal processes that lead to inequality. It builds on rigorous causal inference based on natural or quasi-experimental research designs with a keen interest in “big data” as a promising source for future social science research. Some of his recent work investigates the social costs of law enforcement activity. Legewie serves on the HCPDS Social Demography Seminar planning committee.