Teacher leadership is often defined as a set of practices that enhance the teaching profession. As broad as it is, however, that definition is too limiting. Teacher leadership, as a means to improving schools, “is a powerful strategy to promote effective, collaborative teaching practices in schools that lead to increased student achievement, improved decision making at the school and district level, and create a dynamic teaching profession for the 21st century” (Teacher Leadership Exploratory Commission, 2008, p. 3). When they lead, according to Julian Weissglass (1998), teachers take responsibility for what matters most to them. Teacher leaders, as do leaders within and outside education, share a heightened responsibility for equitable opportunities for the success of their school, students, peers, and communities.