This paper explores understandings related to teacher professionalism amongst a sample of highly engaged members of the Alberta Teacher's Association (ATA). Highlighting the many ways in which the Association supported members in their bid to embody roles as leaders, learners, advocates, and policy actors, I argue that the ATA serves as a platform for the development of teacher leaders and advocates who aim to improve the quality of education on a broader scale through their work both inside and outside the classroom.