 Foreshadowing the central themes of Piaget, Kohlberg, McClelland, Erikson and Robert Kegan, Rank was the first to propose that human development is a lifelong construction, which requires continual negotiation and renegotiation of the dual yearnings for individuation and connection, the will to separate and the will to unite.Decades before Ronald Fairbairn, now credited by many as the inventor in the 1940s of modern object-relations theory, Rank's 1926 lecture on "The Genesis of the Object Relation" marks the first complete statement of this theory (Rank, 1996, pp.