Co-teaching is a social justice pedagogy that can increase educational access to groups of students who have historically been underserved and segregated in their schools. However, a school leader's failure to ensure inclusive cultures and critical support is its greatest obstacle. This retrospective, written by a former administrator and a special education teacher who collaborated on a high school co-teaching model for ten years, offers practical perspectives on implementation and includes actionable leader strategies for creating truly transformative co-taught classrooms.