 In the early 1960s, Attenborough resigned from the permanent staff of the BBC to study for a postgraduate degree in social anthropology at the London School of Economics, interweaving his study with further filming.However, he accepted an invitation to return to the BBC as controller of BBC Two before he could finish the degree.Attenborough became the controller of BBC Two in March 1965, but had a clause inserted in his contract that would allow him to continue making programmes on an occasional basis.