Teacher leaders are valuable members of the school community. However, there is little existing research that explores how teacher leaders shape and enact their roles. In this article we explore how teacher leaders come to understand their role, as well as how principals and other school colleagues interact with teacher leaders and the ways in which those interactions support teacher leader role development. These findings have significant implications in helping us understand how to help teacher leaders develop in their role and the ways in which leaders can foster teacher leadership growth.