This article explores the social and professional dynamics "when teachers face teachers" seeking to impact colleagues' instructional practices to improve student learning. Specifically, it examines a group of 40 teachers leading staff development sessions at their schools in an effort to bring more literacy strategies into the pedagogies of disciplinary teachers. Drawing from the research on distributed leadership and teacher leadership, the study looks at how three factors impact teacher leaders: (1) the actions of the principal; (2) relationships among teachers; and (3) teachers' own beliefs about leadership. Using primarily qualitative methods, supplemented by pre-and-post quantitative survey data, the study found: strong administrative and collegial support for teacher leadership, the use of savvy and emotionally attuned leadership techniques by teachers, and overall impactful sessions. However, not all school environments were conducive to teacher leadership. The article concludes with suggestions for better utilizing teacher leaders for the local enhancement of education reforms. (Contains 1 table.)