Having a great teacher in every classroom is the collective goal and teacher leadership roles help to reach that goal in several ways. First, teacher leadership roles provide a needed platform for teachers to share what they are best at. This could include opening their doors to colleagues, serving as coaches or peer evaluators, sharing curriculum, or leading teacher teams. Teacher leadership roles can be a lever for smart retention -- offering teachers a way to expand their skills and take on new challenges that help them continue to grow professionally while remaining in the classroom. And, teacher leadership promotes a school climate built on collective responsibility for all students to succeed, where administrators and teachers work together to make decisions that are best for students. Teacher leadership structures, however, are only as good as their implementation. Success depends on many "intangibles" -- the types of things that policy briefs don't usually address. The focus here is on cultivating school cultures that support teacher leadership and help it flourish. This document is a compilation of experiences and recommendations, and is intended for teachers and school leaders who share a passion for this important topic.