This article examines the perceptions of experienced teachers who take on the role of leading the development of subject knowledge of new and experienced teachers through a case-study approach. The findings reveal that each teacher was able to identify the impact of leading professional development has on their professional skills. Furthermore, this new role has changed the way that they view themselves as teachers, and their practice as teachers. In conclusion, this research advocates the provision of opportunities for new teacher educators to be involved with other teacher educators, including those more experienced, to explore together their professional knowledge, practice and identity.