The Academy’s Science Action Club (SAC) Program ignites the spark for science in middle school youth and their after school activity leaders in San Francisco and Oakland, CA. Currently there are 20 SAC clubs serving 650 students. Through dynamic and authentic science investigations, youth explore their local environment, make observations about the natural world, and contribute data to real scientific research. The Academy provides after-school programs with blended professional development, science-themed activity modules, and essential supply kits. Each site has an SAC Alliance Team that includes an OST activity leader, site coordinator, school science teacher, school leader, and parent. Partners include the San Francisco and Oakland Unified School Districts, after-school program providers (Beacon Centers, YMCA, Excel) and Citizen Science Partnerships (Cornell Lab of Ornithology, NASA). The SAC program is funded by the Asian Pacific Fund; S. D. Bechtel, Jr. Foundation; The Hearst Foundations; Jackie and Howard Nemerovski; and Pisces Foundation.