Answer: He founded a style of therapy that focused on the unconscious mind.
Explanation: Sigmund Freud (6 May 1856 - 23 September 1939), was an Austrian psychologist, psychoanalyst, clinical psychologist. His contribution to psychology and to our better understanding of this branch is that Freud is considered a father of psychoanalysis, using subconsciously in the process of patients' treatment and sessions. He developed a method of clinical psychoanalysis through a discussion between a patient and a psychoanalyst.