This book traces the philosophical history of Personal Construct Psychology through the broad and complex tradition of phenomenology and thinkers such as Spinoza, Hegel and Heidegger. The author also gives credit to the influence of general creative and dramatic literature across a variety of cultures. Specific issues addressed in depth include the position of Personal Construct Psychology with regard to philosophy of science, determinism and free will, concepts of mental illness and the implications for social and political philosophy.