John Bowlby

Edward John Mostyn Bowlby, known as John Bowlby (London, 1907 – Isle of Skye, Scotland, 1990), was a British psychiatrist and psychoanalyst whose work reshaped the study of child development. He is best remembered for attachment theory, which describes how early emotional bonds with a caregiver shape a person's sense of security and behaviour throughout life. He trained under Melanie Klein but later parted ways with her, arguing that the real history of the relationship with a caregiver mattered more than the child's fantasies about that person.

Born into an upper-middle-class family, he was raised largely by nannies, as was customary for children of his class. His father, a surgeon to the royal household, encouraged him to study medicine at Cambridge. Bowlby left after his third year to teach maladjusted children at Priory Gates, an experience that drew him toward developmental psychology. He then completed his medical and psychiatric training in London and became a psychoanalyst. During the war he worked in child guidance clinics and with the army, and his contact with evacuated children separated from their families deepened his interest in separation.

His first book, Forty-four Juvenile Thieves, published in 1944, linked juvenile stealing to prolonged separations from a main caregiver in early childhood. After the war he became deputy director of the Tavistock Clinic and a mental health adviser to the World Health Organization. His 1951 report on the mental health of homeless children, translated into fourteen languages, stressed the need for constant, loving care. His fullest statement of the theory came in the three-volume Attachment and Loss (1969–1980). A 2002 survey ranked him among the most cited psychologists of the twentieth century. His legacy endures in developmental psychology, clinical work with children and child protection policy.