Our theory of action is informed by research. The single greatest factor of student learning is teaching (Darling-Hammond, 1999; Hamre and Pianta, 2005), thus a fundamental aim of the WestEd/SVMI Math Network is to help teachers craft learning environments in which all students are positioned to engage fully with central mathematical content. For that reason, our approach to professional development is to develop mathematically powerful classrooms taught by highly trained professionals who support every student through engagement, access, and high expectations. In partnership with the Silicon Valley Math Initiative, WSVMI is fostering mathematics education to develop the next generation of problem solvers.