This foundational text offers dynamic and fresh perspectives on theories across the helping professions to help guide client case conceptualization and therapeutic transformation. A diverse group of topical experts provides contemporary insight on the following theories: relational-cultural, psychodynamic, Jungian, Adlerian, existential, person-centered, Gestalt, cognitive behavioral, third-wave cognitive behavioral, rational emotive, reality therapy/choice, family, feminist, constructivist, and emotion-focused theories, as well as creative approaches to counseling used in a variety of theoretical models. Each theory is discussed in terms of historical background; human nature and development; major constructs; applications, including goals, the process of change, traditional and brief interventions, and serious mental health issues; supporting research and limitations; and the case of Clarita. The use of a consistent case study across chapters reinforces the differences between theories and demonstrates how each theory influences the counseling and treatment plan. A complimentary test manual and PowerPoints for instructor use are available by request. Request instructor materials