He amassed further evidence, addressed the many different underlying social and psychological mechanisms and showed that Bowlby was only partially right and often for the wrong reasons. Rutter highlighted the other forms of deprivation found in institutional care, the complexity of separation distress and suggested that anti-social behaviour was not linked to maternal deprivation as such but to family discord. The importance of these refinements of the maternal deprivation hypothesis was to reposition it as a "vulnerability factor" rather than a causative agent, with a number of varied influences determining which path a child will take. After the end of Nicolae Ceauşescu's regime in Romania in 1989, Rutter led the English and Romanian Adoptees Study Team, following many of the orphans adopted into Western families into their teens in a series of substantial studies on the effects of early privation and deprivation across multiple domains affecting child development including attachment and the development of new relationships. The results yielded some reason for optimism. In June 2014, Rutter was the guest on the BBC Radio 4 programme "The Life Scientific", in which he described himself as a Nontheist Quaker, as well as revealing that, at the age of 80, he still worked each day "from about half past eight until about four". Among Rutter's research topics was his extended interest in maternal attachment theory as studied in his book "The Qualities of Mothering" from 1974. In this book, Rutter studies the emergence of several disorders in growing children including "antisocial personality disorder" and "affectionless psychopathology". Rutter concentration is often reflected in his comments dealing with deprived learning environments and deprived emotional environment as these affect the child's growth. One of the principal distinctions which Rutter makes throughout his book titled "The Qualities of Mothering" is the difference between intellectual retardation in the child and the impairment of the emotional growth of the child as the non-development of healthy emotional growth. Rutter has honorary degrees from the Universities of Leiden, Louvain, Birmingham, Edinburgh, Chicago, Minnesota, Ghent, Jyväskylä, Warwick, East Anglia, Cambridge and Yale. He has remained in practice until late into his career and the Michael Rutter Centre for Children and Adolescents, based at Maudsley Hospital, London, is named after him. Rutter is an honorary member of the British Academy and is an elected Fellow of the Royal Society. He is a Founding Fellow of the Academia Europaea and the Academy of Medical Sciences and was knighted in 1992.