Sigmund Freud...

Sigmund Freud, was an Austrian neurologist who founded the the school of psychiatry. 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 treating psychopathology through dialogue between a patient, technically referred to as an "analysand", and a psychoanalyst. Freud redefined sexual desire as the primary motivational energy of human life, developed therapeutic techniques such as the use of free association, created the theory of transference in the therapeutic relationship, and interpreted dreams as sources of insight into unconscious desires. He was an early neurological researcher into cerebral palsy, and a prolific essayist, drawing on psychoanalysis to contribute to the history, interpretation and critique of culture.

While many of Freud's ideas have fallen out of favour or been modified by other analysts, and modern advances in the field of psychology have shown flaws in some of his theories, his work remains influential in clinical approaches, and in the humanities and social sciences. He is considered one of the most prominent thinkers of the 20th century, in terms of originality and intellectual influence.

This best shows Freuds simple genius he just let his patients talk.
Below is a documentary I watched this realy gave me a insight into the subconcious mind.