Sigmund Freud (1856–1939), the founding father of psychoanalysis, was a prolific and profound Austrian neurologist whose revolutionary ideas transformed our understanding of the human psyche. Freud's seminal work 'Psychopathology of Everyday Life' (1901) stands as a classic in the field of psychology for its exploration of the unconscious mechanisms influencing everyday behavior and slips of the tongue, often referred to as 'Freudian slips.' His literary style, characterized by meticulous observation and interpretation of psychological phenomena, rendered his theories both accessible and controversial. Freud's extensive body of work, including 'The Interpretation of Dreams' (1900) and 'Three Essays on the Theory of Sexuality' (1905), delves into the intricacies of the unconscious mind, sexuality, and the development of personality. His conception of the Oedipus complex, the id, ego, and superego, among other constructs, had a lasting impact on psychology, literature, and even everyday language. Despite facing criticism and skepticism, Freud's influence on psychotherapy and modern thought is irrefutable, making him one of the pivotal figures of the 20th century in the realms of psychology, psychiatry, and psychoanalysis.