The book, Teaching ELLs Across Content Areas: Issues and Strategies, is a unique, useful text written for K-12 teachers. This book is the culmination of the professional knowledge, expertise, and experience from the distinguished authors who represent the entire range of the content areas, including: language arts, science, mathematics, technology, arts, psychology, and Hispanic studies. The ELL school population has reached 5.3 million with the increase rate of 51 percent from School Year 1998-1999 to 2008-2009 (NCELA, 2012). By 2025, one out of four K-12 students will be ELLs (NEA Policy Brief, 2013). The NEA data states that the ELLs are the fastest-growing student population group in our schools and providing them with high-quality services and programs is an important investment in America's future (NEA Policy Brief, 2013). With the fast growth of the ELLs in schools, basic information and strategies are needed by all K-12 teachers. This book provides useful information and strategies for all K-12 teachers in content classrooms. This book has three significances. First, the book provides the most needed information for K-12 teachers with issues and strategies that are important in content areas to help ELLs' success. With the fast growth of the ELLs in schools, K-12 teachers need this information in content classrooms. Second, the book fills the gap related to teaching ELLs in content areas. There are some existing books with titles on teaching ELLs across content areas; yet, these books provide general information with fewer books that really address specific content topics. This book is unique because it has the dedicated chapters for specific content areas, e.g., Language Arts, Science, Math, Social Studies with issues and strategies in these respective contents as well as general information, e.g., L2 theories for teachers to know and work with ELLs. Third, the book is reader-friendly with carefully-crafted chapters. Each chapter begins with a scenario to catch the reader's attention, is followed by issues and strategies, and ends with a summary. A scenario begins with each chapter for teachers to get to know the ELLs with the content that focuses on the related information and teaching strategies. With the continued increase in the ELL school population, this book is intended helping all K-12 teachers in content areas have knowledge and strategies to better serve their ELLs.