John Bowlby

Edward John Mostyn Bowlby was a British psychiatrist and psychoanalyst, notable for his interest in child development and for his pioneering work in attachment theory. Bowlby was inspired by Melanie Klein during his psychoanalytic training. Melanie Klein was his supervisor; however, they had different views about the role of the mother in the treatment of a three-year-old boy. Specifically and importantly, Klein stressed the role of the child's fantasies about his mother, but Bowlby emphasised the actual history of the relationship. A Review of General Psychology survey, published in 2002, ranked Bowlby as the 49th most cited psychologist of the 20th century.

— Source: Wikipedia (CC-BY-SA).