Too often, “teacher leadership” roles intended to attract and retain teachers—especially great ones—and close student learning gaps fail to produce the intended impact. This two-page brief offers a quick list of the common pitfalls of designing such roles, and a chart of the 12 essential factors for creating high-quality, lasting teacher-leader roles. Defining and organizing high-impact teacher-leader roles can allow great teachers to have a far greater effect on vastly more students and teaching peers.