This book is designed as an introduction to the topic of diverse second language student audiences in U.S. post-secondary education.  It is appropriate for those interested in working with students in academic settings, especially those students who are transitioning from secondary to post-secondary education.  It provides a coherent synthesis and summary not only of the scope and nature of the changes but of their practical implications for program administration, course design, and classroom instruction, particularly for writing courses. For pre-service teachers and those new(er) to the field of working with L2 student writers, it offers an accessible and focused look at the “audience” issues with many practical suggestions.  For teacher-educators and administrators, it offers a resource that can inform their own decision-making.