Available for the first time in English, this work explores a range of mental disorders in the context of Frankl's theory of human motivation. Skillfully translated and featuring extensive annotation, this English language edition remains true to the original while updating assessment and treatment protocols to be compatible with 21st century medicine. As the title suggests, On the Theory and Therapy of Mental Disorders applies a theoretical treatise to the practical treatment of variety of disorders. This long-awaited addition to the body of English language literature introduces Viktor Frankl's clinical insights to a new generation of mental health professionals, and has much to offer to practitioners of all levels of experience.