Sándor Ferenczi (1873–1933), a Hungarian physician and psychoanalyst of Jewish origin, was Freud’s main interlocutor and is considered the precursor of the major changes undergone by contemporary psychoanalysis. Not only in terms of the analytical relationship but also in terms of the importance attributed to countertransference and the psychic processes that occur in the mind of the psychoanalyst. In addition, Ferenczi made indispensable contributions to psychoanalytic psychopathology. His original theory about the occurrence of psychic trauma, conceived in three moments and centered on the disavowal of the testimony of the violated subject, led him to formulate the defense mechanism of identification with the aggressor, indicating as a major consequence the narcissistic split, typical of borderline patients. The clinical management of the traumatized analysand enabled Ferenczi to create an “empathic” clinical style, which is based on regression in transference and shared play in the analytical setting.