The individual remembered for their contributions to the development of modern psychology is Sigmund Freud. Considered the father of psychoanalysis, Freud introduced groundbreaking concepts such as the unconscious mind, defense mechanisms, and the significance of childhood experiences in shaping personality. His theories challenged conventional thought and laid the foundation for various therapeutic practices. Freud's work led to the emergence of psychoanalytic therapy, which emphasizes understanding the interplay between conscious and unconscious processes. While his ideas faced criticism and evolved over time, Freud's impact on psychology remains profound, influencing both clinical practice and theoretical discourse.