This resource will help school leaders and other professional development providers conduct ongoing, structured learning opportunities for mathematics teachers (Ku12). The authors present models for professional development and the preparation of PD leaders designed and field-tested as part of two research projects supported by the National Science Foundation. The Problem-Solving Cycle model and the Mathematics Leadership Preparation model focus on topics of primary interest to mathematics teachersumathematics content, classroom instruction, and student learning. They are intentionally...