In this session, teachers, school and district leadership will learn about an innovative model supporting K-12 math teachers across all schools in the Hartford Public School system during the first two years of implementation of the Building Thinking Classrooms practices. Attendees will explore the components of this model, including the use of collaborative learning teams and a problem of practice protocol. Additionally, the presenters will share research and data from teachers and key takeaways for facilitators. Session attendees will be encouraged to consider ways to apply this model in their own district or context and leave inspired to empower teachers within their own district to become transformative teacher leaders.