Rising enrollments of students for whom English is not a first language mean that every teacher - whether teaching kindergarten or high school algebra - is a language teacher. This book explains what teachers need to know about language in order to be more effective in the classroom, and it shows how teacher education might help them gain that knowledge. It focuses especially on features of academic English and gives examples of the many aspects of teaching and learning to which language is key. This second edition reflects the now greatly expanded knowledge base about academic language and classroom discourse, and highlights the pivotal role that language plays in learning and schooling. The volume will be of interest to teachers, teacher educators, professional development specialists, administrators, and all those interested in helping to ensure student success in the classroom and beyond.