Teachers have the greatest school-based effect on the achievement of any child in their classrooms, but highly effective principals can positively affect the achievement of every student in their schools. The difference between a highly effective principal and an average one is equal to two-to-seven months of extra learning per year for each child…

Through its engagement with grantees on initiatives to improve school leadership, The Wallace Foundation came to recognize the important role that state organizations play in advancing effective leadership in districts and schools as well as the importance of coordination among state- and district-level policies. The authors have recently…