In this introduction, we establish why school leaders must be attentive to how the organization of educational programs for English Learners impacts the degree to which they are segregated or integrated. We preview each article in the special issue and clarify the contributions that these pieces collectively make to research and practice. We argue that taken together the articles make the case that school leaders must balance separation and integration in a way that fosters equity of opportunity and affirms English Learners' multilingual and multicultural identities.