attachment theory was the brainchild of a psychologist and researcher called John Bolby. He began his work in the 1950s after World War II. What he found was there were some kids that seemed to have much more secure relationships, to be a lot less worried about their relationships compared to others. There was also this emerging idea that how we look after and care for children when they are infants actually seems to be quite important. And what he thought was this probably has something to do with the role and the differing role that parents had with their kids during WWII.