This book is written to help school leaders support mathematics education in schools. It is for both new administrators, principals, assistant/vice principals, or instructional leaders who do not have a strong background in mathematics education as well as for math coaches and the experienced mathematics leader. It provides a concise summary and overview of research about the changes in mathematics education; discusses the principalAEs role in leading effective mathematics instruction; offers strategies for observing and evaluating mathematics instruction in classrooms; provides suggestions for supporting faculty, including co-teaching and job embedded professional learning initiatives; and includes tools and templates school leaders can use in their work with faculty.