The answer to the crossword for the term 'THE EGO AND THE ID AUTHOR' is Freud (5 letters). 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 best known for his theories of the unconscious mind, especially the notion of the ego, the id, and the superego, which are three distinct, yet interacting agents in the psychic apparatus.