The field of psychology is very young and is the descendant of philosophy. Although Sigmund Freud was not the individual who separated the two, his contributions to psychology still resonate in the field today. This article will discuss biographical information, review his theories and published works, and show how "his contributions to psychoanalytic theory explain his worldwide fame" (Galbis-Reig, 2003). Born in the Moravian town of Freiberg on May 6, 1856, Sigmund Freud was the son of a wool merchant. His mother was twenty-one when she gave birth to him. She was Jacob Freud's second wife and half his age. His first wife bore him two sons, Emmanuel and Phillip, who lived nearby with their mother. John, Sigmund Freud's best friend, was his nephew. John was the son of Emmanuel, Freud's older half-brother, and was one year older than Freud (Gay, 1988). Calling a younger uncle must have been difficult for John, but the two were best friends. Throughout their childhood, they were typical boys, playing and fighting with each other in the small town where they lived. Freud's father was the go-between when the two boys argued and always scolded Freud when he did something wrong. According to Gay, during one particular episode recalled by Freud, Freud's father asked why he had hit John, to which Freud replied: "I beat him, because he beat me" ( 1988). Over time, Freud found that he was becoming more and more violent. increasingly sexually attracted to his mother. The possibility of his sexual attraction was perhaps linked to his mother's immense love and admiration for him. He was her firstborn and she adored him as any young mother dotes on her child. Freud spent his early years entirely in his company and under his care, and his first middle of paper ...... followed Freud wrote his complete works, all twelve volumes, despite oral cancer discovered in 1923, that he had removed. He also helped the International Society of Psychoanalysis in its financial difficulties by writing the “New Introductory Lectures on Psychoanalysis” (Gould and Howson, 2009). Freud's advancing age as Hitler rose to power made his trip to London in 1938 fatal. He died the following year as war broke out across the world. Sigmund Freud's imprint on the world is vast and immense. Psychology and psychoanalysis are still in their infancy, and more is learned about the mind every year. All great men who give to humanity inevitably find some part of their work refuted, ridiculed and even proven to be the greatest contribution to humanity. Freud is indeed the father of modern psychology, just as Einstein is the father of modern physics...