In this article, the author synthesizes 25 years of his research on the personal therapy of mental health professionals. The author summarizes the high prevalence of personal treatment, its use by seasoned practitioners, its personal and professional goals, its typically positive outcomes, and its lasting lessons concerning the practice of psychotherapy. Particular attention is devoted to the therapist's selection of a personal therapist and the conduct of treatment with patients who are themselves psychotherapists in comparison with patients who are laypersons. The cumulative results indicate that personal therapy is an emotionally vital, interpersonally dense, and professionally formative experience that should be central to the development of health care psychologists.