This book tells the stories of 15 world language (WL) teachers in the United States at elementary and secondary levels through rich descriptions of their lived worlds and experiences. In-depth interviews, extensive observations, learner interviews, and document and environment analysis illustrate in detail how teacher beliefs relate to their practices and are mediated and moderated by their learners, institutional demands, equity and access to WL education and other factors. The chapters provide a deep and robust explanation of individual teachers teaching lives and a cross-contextual comparison of their experiences, shining a light on the realities and demands of modern US schools. Grounded in the research literature on language teacher beliefs and cognition, this book takes the stance that all teaching is situated and contextual, and that addressing teachers' methods, practices and knowledges in ways that are divorced from their setting and environment has serious limitations. It offers fascinating insights for researchers, language educators and pre- and in-service teachers, with reflection questions at the end of each chapter to guide readers in drawing connections with their own practice, interests and contexts.