Broadening participation in STEM requires a change in how K-12 teachers engage and educate students who identify as Black, Indigenous, and People of Color. The CRAFT project provides a field-based science and mathematics teacher education program that supports teaching focused on students’ affective development through culturally responsive practices. CRAFT is working to accomplish the following objectives: (1) transform the practices of a district-wide set of 48 secondary science and mathematics teachers by equipping them with culturally responsive, affective-focused practices and leadership skills; (2) construct tools and resources that will serve as open-access professional development materials shared widely via learning management tools; and (3) develop an evidence-based and adaptable theory of change to share widely with the STEM education community.