All teachers face challenges in helping English language learners (ELLs) reach proficiency in content areas while learning English. ESL teachers are essential in helping ELLs to face the twin challenges of achieving in content areas and developing academic English proficiency. This article discusses how ESL teachers can continue to help students develop English language proficiency skills, while also collaborating with colleagues to support planning, instruction, and assessment that serve all students--including ELLs. It also discusses two keys to understanding the changing roles of teachers as the entire school community shares responsibility for educating ELLs. These are: (1) integration; and (2) collaboration. Implications for staff development are presented.