This article provides a historical overview of the Existential-Phenomenological tradition in psychiatry and psychotherapy, tracing its development from its origin in nineteenth and twentieth century philosophical thought, through its major European psychiatric proponents and schools, to its emergence as an influential approach in North America after World War II. The emphasis is on the implicit themes that provide continuity within this movement as well as on the distinctive contributions of individual thinkers. We conclude with a discussion of the present status and future prospects of this tradition.