This article attempts to provide ESL teachers, school administrators, and policymakers with a concise overview of what matters in promoting academic success among learners of English in Canadian schools. We review research focused on bilingual and biliteracy development, the nature of academic language, and the roles of societal power relations and identity negotiation in determining the academic achievement of English language learners (ELL). On the basis of this research, we propose the Literacy Engagement framework that identifies literacy engagement as a major determinant of literacy achievement for ELL and non-ELL students. In order to enable ELL students to engage with literacy, the framework highlights the importance of teachers scaffolding meaning, connecting with students' lives, affirming student identities, and extending their awareness and knowledge of language across the curriculum. The application of the framework is illustrated with reference to the literacy and academic learning experiences of two ELL students in the Toronto area. (Contains 6 figures.)