This chapter provides a biographical sketch of Fritz Perls, the founder of Gestalt therapy. It outlines the underlying philosophy and basic principles that guide the Gestalt therapist. The beginning of Gestalt Therapy is identified best by the writing of Perls’s classic work, Ego, Hunger, and Aggression, which was originally viewed as a revision of Freud’s Psychoanalysis. The target of Gestalt Therapy is the individual perceiver as he or she lives (flows through) life. The Gestalt therapist places more value in action than in words, in experience than in thoughts, in the living process of therapeutic interaction and the inner change resulting thereby than in influencing beliefs. Case management is the process of maintaining contact with the client while facilitating the interpersonal relationship consistent with Gestalt therapy principles. The interpersonal nature of Gestalt Therapy is a strength, from a practical, therapeutic standpoint, but it is also a theoretical weakness.