Many states across the nation are working to improve school leadership, some on a substantial scale. Several factors encourage state-level work focused on principals, including: research evidence of principal effects on student learning, flexibility in the Every Student Succeeds Act (ESSA), new national professional standards for principals, lessons learned from teacher evaluation and development, and available support from organizations with a focus on school leadership. The Council of Chief State School Officers (CCSSO), with funding from The Wallace Foundation, supported states through two principal-focused "action groups" during the 2016-17 school year. Each action group convened teams of state staff for a series of facilitated in-person meetings and webinars through which each state could develop and carry out action plans that identified a problem of practice and strategies for rapid implementation. Teams included state education agency (SEA) division directors, program managers, and line staff. Twenty-eight states joined the groups, with a shared interest in working on principal evaluation and support and/or principal professional learning. This brief is intended to inform state leaders and others in the field about the participating states' efforts to strengthen the recruitment, preparation, support, and supervision of school leaders. It summarizes the state teams' priorities, accomplishments, and perspectives related to school leadership. These states are not representative of the nation, but their priorities and activities in school leadership reveal trends in approaches and needs, along with examples of state initiatives underway or planned. One-page state snapshots appear in the Appendix. The states generously shared the information and ideas presented in this report through (1) telephone interviews with 33 participants in 25 states and (2) a survey with responses from 55 participants in 25 states (70% response rate). Representatives from each participating state were given an opportunity to review and vet information shared about their state. [Prepared for Council of Chief State School Officers.]