The term 'Founder of Psychoanalysis' can be answered with the 5-letter word 'Freud'. Sigmund Freud was an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst. He is widely considered to be one of the most influential and controversial minds of the 20th century. Freud's theories of the unconscious mind, defense mechanisms, and the interpretation of dreams had a profound impact on psychology and continue to influence modern psychotherapy.