John Bowlby (1907–1990), born Edward John Mostyn Bowlby, was a British psychiatrist and psychoanalyst and the principal originator of attachment theory. He trained at the Institute of Psycho-Analysis in London in the 1930s, analysed by Joan Riviere and supervised in child analysis by Melanie Klein, and spent most of his career at the Tavistock Clinic, working with children and their families. His study of juvenile thieves (1944) and his report for the World Health Organization, Maternal Care and Mental Health1 (1951), argued that prolonged separation from the mother in early childhood is a major cause of later disturbance, and gave the notion of maternal deprivation wide currency.
From 1957 he set out, first in papers to the British Psycho-Analytical Society and then in the trilogy Attachment and Loss (1969–1980), a theory in which the child's tie to the mother is the work of an evolved behavioural system rather than a by-product of feeding. In place of Freud's model of psychic energy he drew on ethology, evolutionary biology and control theory. The theory's central notions include separation anxiety as a primary response to the loss of an attachment figure, internal working models of self and others, and the secure base, a notion he took up from his long-standing collaborator Mary Ainsworth. His insistence that real events in the family, above all separation and loss, matter more than the child's phantasies left him isolated within British psychoanalysis. Attachment theory itself became a leading framework in developmental psychology and later fed into relational psychoanalysis.