Sigmund Freud was an Austrian neurologist who founded psychoanalysis, a revolutionary clinical method for investigating and treating pathologies of the mind through dialogue. Born Sigismund Schlomo Freud in 1856, he developed a highly influential theory of human agency and psychic structure that fundamentally reshaped twentieth-century thought, literature, and culture. His clinical innovations, including free association, dream analysis, and the study of transference, sought to map the hidden depths of the human unconscious.\n\nThroughout his prolific writing career, Freud introduced concepts that became central to modern intellectual discourse. He redefined human sexuality by identifying infantile stages of development and formulating the Oedipus complex. His landmark theories on dream interpretation as a form of wish fulfillment provided a foundation for understanding psychological repression. He later structured the human psyche into three distinct components—the id, ego, and superego—and theorized the existence of libido and the death drive to explain human motivation, aggression, and guilt.\n\nIn his later years, Freud expanded his psychoanalytic framework to offer sweeping critiques of religion, society, and culture. Although the clinical dominance of psychoanalysis has evolved, his literary and theoretical contributions remain deeply influential across psychology, philosophy, and the humanities. His work established a new vocabulary for self-reflection, permanently altering how humanity conceptualizes memory, desire, and the self.