
Sigmund Freud, physiologist, medical doctor, psychologist and father of psychoanalysis, was an influential thinker of the twentieth century. Working initially in close collaboration with Joseph Breuer, Freud elaborated the theory that the mind is a complex energy-system, the structural investigation of which is proper province of psychology. He articulated and refined the concepts of the unconscious, of infantile sexuality, of repression, and proposed a tripartite account of the mind’s structure, all as part of a radically new conceptual and therapeutic...