School Leadership Research study examines the career paths of principals and teachers, district policies that affect the distribution of human resources across schools, and the impact of educator characteristics and mobility patterns on student outcomes. The research covers a broad range of issues in school leadership, including school leadership labor markets, school leadership preparation, how school leaders are distributed across schools, and school leadership retention, particularly in urban, low-performing schools. The research is funded by organizations interested in evaluating existing education policies in order to identify ways to improve those policies or develop new policies as needed. We have received financial support from The Institute of Education Sciences, The Spencer Foundation, The Joyce Foundation, and the Stanford University K-12 Education Initiative.