This book presents critically oriented, transformative-in-practice, and empower-in-nature language teacher education to prepare English teachers to implement Global Englishes Language Teaching (GELT). Preparing teachers to implement GELT is not a simple or straightforward process. Yet, few attempts have brought forward theoretical foundations and real-life examples of preparing teachers to implement GELT in the classrooms. Since GELT is relevant to learners’ needs for communication in the globalized world and it continues to receive tremendous interest from language teacher education worldwide, we cannot risk leaving the knowledge of how to prepare teachers to implement GELT unknown. This book fills in this considerable gap in the literature by presenting accessible theoretical foundations and practical examples of preparing teachers to implement GELT using an existing case of teacher education for GELT – M.Ed. in Teaching English as a Global Language (TEGL), Faculty of Education, Burapha University, Thailand. Through critically oriented frameworks, the TEGL program aims to equip in-service English teachers with a critical lens to examine their current practices, challenge the history-in-person (sociocultural and educational) backgrounds that teachers bring into teacher education, and empower them in transforming their classroom practices to correspond with the GELT paradigm. The book highlights how the global spread of English impacts language teacher education, discusses the theoretical foundations underlying the design of teacher education for GELT, addresses the underlying knowledge base for preparing teachers to implement GELT and examines the theoretical foundations and practical applications of teacher education for GELT. It is vital reading for graduate students, teacher educators, and researchers in language teacher education and beyond.