This publication highlights eight charter school authorizers – the agencies responsible for approving, monitoring, assisting and evaluating charter schools – that are advancing the quality and growth of charter schools across the country. Developed by Lucy Steiner, Julie Kowal, Sarah Crittenden and Bryan Hassel, in partnership with WestEd, for the U.S. Department of Education’s Office of Innovation and Improvement, the Guide explores the practices and policies of these authorizing offices and is designed to inform and inspire others to follow their lead in creating and supporting high-quality charter schools.