children. Career in Geneva 1920–23 and work with Jean Piaget In 1920 she attended the sixth congress of the International Psychoanalytical Association in The Hague, where she gave a talk on the origins of language in childhood. The audience included Sigmund Freud, his daughter Anna Freud, Melanie Klein and Sandor Ferenczi. She also announced her intention to join the staff of the Rousseau Institute in Geneva, a pioneering clinical, training and research centre for child development in Geneva. She remained there for three years, working alongside its founder Édouard Claparède, as well as other distinguished psychologists of the time including Pierre Bovet. While she was there, Jean Piaget also joined the staff: they collaborated closely, and in 1921 he went into an eight-month analysis with her. In 1922, she and Piaget both delivered papers at the seventh congress of the International Psychoanalytical Association in Berlin. This was one of the most productive periods of her life, and she published twenty papers between 1920 and 1923. The most important of these was a new version of the paper she had given at the Hague on the origins of language, drawing on her collaboration with the linguist Charles Bally. Entitled "The origins of the words 'Papa' and 'Mama'", she described how language develops on a substrate of genetic readiness, first through interactions between the child and the mother's breast, and then through family and social interactions. Her other papers from the time are mainly devoted to bring psychoanalytic thought together with observational studies of child development,. Her papers in the Zeitschrift and Imago from this time mainly focus on the importance of speech acquisition in early childhood and the sense of time. However, Otto Fenichel singled out for special mention her 1923 article on voyeurism, where “Sabina Spielrein described a peeping perversion in which the patient tried to overcome an early repression of genital and manual erotogeneity, provoked by an intense castration fear”. Overall, her work during this period is thought to have had considerable influence on Piaget's thought, and possibly on Klein's. In 1923, discouraged by her lack of success in building up a private practice in Geneva, and with Freud's support, she decided to travel to Moscow to support the development of psychoanalysis there. She planned to return to Geneva, and left her personal papers, including all her diaries and correspondence, in the basement of the Rousseau Institute. In the