This critical volume provides accessible examples of how K-12 teachers use systemic functional linguistics (SFL) and action research to support the disciplinary literacy development of diverse learners in the context of high-stakes school reform. With chapters from teachers, teacher educators, and researchers, this book paves the way for teachers to act as change agents in their schools to design and implement meaningful curriculum, instruction, and assessment that builds on students' cultural and linguistic knowledge. Addressing case studies and contexts, this book provides the framework, tools, and resources for instructing and supporting multilingual students and ELL. This volume - intended for pre- and in-service teachers - aims to improve educators' professional practice through critical SFL pedagogy and helps teachers combat racism and anti-immigrant rhetoric by contributing to an equity agenda in their schools.