The Calgary Board of Education has invested in math coaches as a key action in its K-12 Mathematics Strategy. These coaches have been deployed in numerous schools with the goal of improving teacher practice and student learning. We have learned a lot about content-focused coaching, developing coaching partnerships, and engaging in effective coaching cycles through this process that other districts would benefit from. Administrators, consultants, specialists, and teachers would benefit from our lessons learned to implement this job-embedded form of professional learning in their schools.