This book on service-learning for teachers learning TESOL techniques addresses the needs of the English Language Learners in the United States – the fastest growing segment of the United States population. Our schools and communities are greatly impacted by this changing population. This book details a highly effective service-learning project which assists preservice teachers in learning the value of critical pedagogy, and how mentoring ELLs can improve TESOL techniques, impact schools, and empower ELLs, using the National ESOL Standards.