The National Center for Analysis of Longitudinal Data in Education Research (CALDER) informs education policy development through analyses of data on individual students and teachers over time. The Center’s research focuses most centrally on how teacher policies, governance policies, and social and economic community conditions affect outcomes for teachers and their students. By capitalizing on rich longitudinal data, the Center can explore a breadth of critical education issues and present research advancements of the highest quality to policymakers. Throughout the course of this work, CALDER makes significant technical and analytic contributions to the field as it mines growing sources of state administrative longitudinal data with state-of-the-art econometric techniques.