Over a five-year period, the Foundations for Success project will provide Cognitively Guided Instruction (CGI) professional development in mathematics for 2,790 elementary teachers and 120 elementary school principals. Participating teachers will receive eight days of professional development during each year of their participation. Designed and led by the CGI Math Teacher Learning Center under the direction of Linda Levi, the CGI professional development program is a three-year, eight-day-per year program focused on number, operations, and algebraic thinking at the K–2 or 3–5 grade levels. Working with an advisory board with extensive expertise and experience supporting equity and excellence in mathematics, the Foundations for Success program will integrate evidence-based practices in early mathematics, fractions, and problem solving with promising practices for teaching traditionally underserved and underrepresented students (and their teachers) in mathematics.