While many schools are experimenting with new fads and formulas in an effort to ensure that all students receive what they need to be successful, others have begun to look anew at the resources they already have: teachers. Each teacher brings a unique combination of knowledge, skills, experiences, passions, and talents to his or her school, just as students do to their classrooms. When teachers are able to exchange expertise, challenge each other to meet high expectations, and support each other to meet them, they better serve their own students while also being a tremendous resource for improving the quality of each other's teaching. They become teacher leaders. The knowledge and skills teachers need to be effective as leaders largely lie beyond what most learn in their teacher preparation programs. This includes knowledge of how to build community and shared ownership, managing groups, facilitating dialogue, leading professional learning, guiding evidence-based decision-making, systems thinking, communication and advocacy, and self-care.