Understanding a student’s ethnic identity process coupled with the student’s sexual identity and psychosocial identity can provide a much more useful and informative portrait of his or her circumstances than merely knowing the student as a “19-year-old sophomore”. This book was developed with both the student affairs professional and the student affairs graduate student in mind. After a brief introduction, it discusses various human development theories such as Schlossberg’s transition theory, Erikson’s theory of psychosocial development, Perry’s theory of moral development, and Kolb’s theory of experiential learning as well as personality types based on the Myers–Briggs type indicator. In the subsequent section of the book, the focus is on identity development in college students, with chapters covering Chickering’s Theory and the seven vectors of development, Black and biracial identity development theories, White identity development, and the lesbian, gay, bisexual, transgender, and queer (LGBTQ) identity development as well as disability and identity development. and career development theories. The final section of the book describes the factors that impact the selection of careers with chapters discussing the Holland’s theory of career development and Bronfenbrenner’s ecological systems theory, among other issues. Theory-based chapters open with a vignette in which the reader is presented with specific details of a case study for consideration. At the end of the chapter, the case is revisited and considered using a theoretical framework. Each case vignette provides the reader with immersion into a diverse perspective, and the chapter authors provide a clear discussion of their conceptualization of the student.