Sigmund Freud (IPA2: ˈziːkmʊnt ˈfʁɔʏt), born Sigismund Shlomo Freud (May 6, 1856  September 23, 1939), was an Austrian psychiatrist who founded the psychoanalytic school of psychology. Freud is best known for his theories of the unconscious mind and the defense mechanism of repression and for creating the clinical practice of psychoanalysis for curing psychopathology through dialogue between a patient and a psychoanalyst. Freud is also renowned for his redefinition of sexual desire as the primary motivational energy of human life, as well as his therapeutic techniques, including the use of free association, his theory of transference in the therapeutic relationship, and the interpretation of dreams as sources of insight into unconscious desires.

Early life

Sigmund Freud was born on 6 May, 1856 to Galician Jewish parents in Příbor ( ), Moravia, Austrian Empire, now Czech Republic. His father Jakob was 41, a wool merchant, and had two children by a previous marriage. His mother Amalié (née Nathansohn), the third wife of Jakob, was 21. He was the first of their eight children and owing to his precocious intellect, his parents favoured him over his siblings from the early stages of his childhood; and despite their poverty, they sacrificed everything to give him a proper education. Due to the economic crisis of 1857, Freud's father lost his business, and the family moved first to Leipzig before settling in Vienna. In 1865, Sigmund entered the Leopoldstädter Kommunal-Realgymnasium, a prominent high school. Freud was an outstanding pupil and graduated the Matura in 1873 with honors.

After planning to study law, Freud joined the medical faculty at University of Vienna to study under Darwinist Prof. Karl Claus. At that time, eel life history was still unknown, and due to their mysterious origins and migrations, a racist association was often made between eels and Jews and Gypsies. In search for their male sex organs, Freud spent four weeks at the Austrian zoological research station in Trieste, dissecting hundreds of eels without finding more than his predecessors such as Simon von Syrski. In 1876, he published his first paper about "the testicles of eels" in the "Mitteilungen der österreichischen Akademie der Wissenschaften", conceding that he could not solve the matter either. Frustrated by the lack of success that would have gained him fame, Freud chose to change his course of study. Biographers like Siegfried Bernfeld wonder if and how this early episode was significant for his later work regarding hidden sexuality and frustrations.

Medical school

In 1874, the concept of "psychodynamics" was proposed with the publication of Lectures on Physiology by German physiologist Ernst Wilhelm von Brücke who, in coordination with physicist Hermann von Helmholtz, one of the formulators of the first law of thermodynamics (conservation of energy), supposed that all living organisms are energy-systems also governed by this principle. During this year, at the University of Vienna, Brücke served as supervisor for first-year medical student Sigmund Freud who adopted this new "dynamic" physiology. In his Lectures on Physiology, Brücke set forth the radical view that the living organism is a dynamic system to which the laws of chemistry and physics apply. This was the starting point for Freud's dynamic psychology of the mind and its relation to the unconscious. The origins of Freud's basic model, based on the fundamentals of chemistry and physics, according to John Bowlby, stems from Brücke, Meynert, Breuer, Helmholtz, and Herbart. In 1879, Freud interrupted his studies to complete his one year of obligatory military service, and in 1881 he received his Dr. med. (M.D.) with the thesis Über das Rückenmark niederer Fischarten ("on the spinal cord of lower fish species").