Melanie Klein (née Reizes; 30 March 1882 – 22 September 1960) was an Austrian-British author and psychoanalyst known for her work in child analysis. She was the primary figure in the development of object relations theory. Klein suggested that pre-verbal existential anxiety in infancy catalyzed the formation of the unconscious, which resulted in the unconscious splitting of the world into good and bad idealizations. In her theory, how the child resolves that split depends on the constitution of the child and the character of nurturing the child experiences. The quality of resolution can inform the presence, absence, and/or type of distresses a person experiences later in life.
Melanie Klein was born into a Jewish family and spent most of her early life in Vienna. She was the fourth and final child of parents Moriz, a doctor, and Libussa Reizes. Educated at the Gymnasium, Klein planned to study medicine. Her family's loss of wealth caused her to change her plans.
At the age of 21 she married an industrial chemist, Arthur Klein, and soon after gave birth to their first child, Melitta. Her son Hans followed in 1907 and her second son Erich was born in 1914. While she would go on to bear two additional children, Klein suffered from clinical depression, with these pregnancies taking quite a toll on her. This and her unhappy marriage soon led Klein to seek treatment. Shortly after her family moved to Budapest in 1910, Klein began a course of therapy with psychoanalyst Sándor Ferenczi. It was during their time together that Klein expressed interest in the study of psychoanalysis.
Encouraged by Ferenczi, Klein began her studies by observing her own children. Until this time, only minimal documentation existed on the topic of psychoanalysis in children, Klein took advantage of this by developing her "play technique". According to Klein, play is symbolic of unconscious material and can be interpreted and analyzed in the same way that dreams and free associations are in adults. Her research later contributed to the development of play therapy.