Two candidates announced for Stapleton Elementary School principal in Framingham FRAMINGHAM — The district has announced two finalists for principal at the Stapleton Elementary School. Sara Costa Yuen and Caitlin Shelburne are each vying for the position, according to a statement from the schools. Yuen is principal of the Phoenix Charter Academy Chelsea in Chelsea. She is former program director for the nonprofit Portuguese Language School of the MetroWest Mission Hub (ProGente Connections). Before that, Yuen taught math and English Language Arts in the Phoenix Charter Academy in Chelsea and social studies in Lawrence Public Schools. Yuen holds a bachelor's degree in international relations with a minor in Latin American Studies from Boston University. She also holds a master's degree in education policy and management from Harvard University.