Michael Rutter (1933 - 2021)
Rutter was heavily influenced by the work of John Bowlby, he used Bowlby's theory as the foundations of his own research.
He stated that Bowlby did not recognise the different between the following:
1. A baby who had never formed an attachment with a mother. (Privation)
2. A baby who had formed an attachment with the mother but then experienced separation. (Deprivation).
Rutter's work developed some very key and valid points applicable to every day practice.
Therefore creating the name of his theory Privation vs Deprivation.