All psychoanalytically-informed theories and therapies (some of them also called psychodynamic) are based on the work of Sigmund Freud.
Freud was a neurologist who founded the discipline of psychoanalysis at the end of the 19th century, within the context of the psychiatry of his time. Psychoanalysis was named, by one of Freud’s patients, as a ‘talking cure’. Freud found listening to his patients and allowing them to speak about their symptoms brought relief and understanding. Freud defined psychoanalysis in a way that was threefold: as a theory of psychological functioning and human subjectivity, as a method of research of the human psyche and its cultural productions, and as a form of treatment / therapy for psychologically determined symptoms.