Teacher leadership has been defined by researchers as the catalyst for change, and the impetus for school improvement. In this study, the researcher investigated the experiences of teachers and administrators who participated in a nationwide teacher leadership pilot, the Teacher Leadership Initiative (TLI), and the effects that this yearlong event had on leadership, school improvement, and teacher and administrator professional practices. Unifying outcomes from the participants included changes in thinking about leadership that directly improved professional efficacy, collaborative and leadership skills, and a new sense of identification as a leader that was not experienced before the TLI.