The purpose of "Theory of College Student Development" is to provide readers with new theoretical knowledge or a reminder of the foundational and evolving theories that professionals can utilize for understanding and making sense of students' behavior. Its primary focus is on the integration of knowledge, skills, and application of such theories in such a way as to emphasize utility and application. A unique component is its emphasis on professional competence, professional identity, and theoretical application. Unlike previously published case study books designed to reach student development theory, this text utilizes a single case that allows readers to see how a range of theories are applicable to this one case. Theories presented for application include both foundational and evolving theoretical perspectives. The twelve chapters have been written by both faculty and practitioners. Each coeditor and chapter author brings unique perspectives and lens of viewing theory and application, representing their experiences, talents, and expertise. It features authors who represent the best of the best, and these authors challenged us to be more innovative as we reimagine the evolution of student development theory. The editors had two specific audiences in mind: faculty and higher education practitioners. With over two hundred graduate preparation programs in the United States, most offering a student development theory course, this book will help graduate faculty, both new and seasoned, with a mechanism for teaching theory in a fun, relevant, and innovative way.