real life events and not unconscious fantasies—were rejected by psychoanalysts, and Bowlby was effectively ostracised by the psychoanalytic community. He later expressed the view that his interest in real-life experiences and situations was "alien to the Kleinian outlook". Furthermore, Bowlby explained in an interview with Milton Stenn in 1977 that the psychoanalytic community did not accept his developmental theories as they were completely different from the unconscious fantasy theories surrounding psychoanalysis during that time. He further explained that: There were certain groups who took to it with great enthusiasm, other groups were directly lukewarm and other hostile, each profession reacted differently. The social workers took to it with enthusiasm; the psychoanalysts treated it with caution, curiously and for me infuriatingly pediatricians were initially hostile but subsequently many of them became very supporting; adult psychiatrists totally uninterested, totally ignorant, totally uninterested. Donald Winnicott, who was a pediatrician and child psychoanalyst, had an immense influence on Bowlby's work and career. Bowlby and Winnicott had several similarities within their professional work as they were the first to explain the importance of social interactions at an early age. Both Bowlby and Winnicott argued that humans come into the world with a predisposition to be sensitive to social interactions and to need these interactions in order to have a healthy development. However, although Bowlby and Winnicott's ideas were similar, they took vastly different approaches when dealing with their research. For example, Bowlby was interested in how a child's environment is internalized and affects the child's development, while Winnicott was more interested in "the way the inner world engages with and thereby is affected by external events". Despite their differences in approaching their research interests, Bowlby explained in an interview that his research for the World Health Organization influenced policies regarding child care; however, none of this would have been possible without the help of Winnicott. Winnicott worked more at a clinical level than Bowlby which influenced several social workers as he spent his career working to change policies. Bowlby explained that Winnicott is one of the more important individuals who was able to push Bowlby's work to change policies. Maternal deprivation In 1949, Bowlby's earlier work on delinquent and affectionless children and the effects of hospitalised and institutionalised care led to his being commissioned to write the World Health Organization's report on the mental health of homeless children in post-war Europe. The result was Maternal