However, by the mid-1970s conferences began to be held less regularly, and academics worked on their own individual branch of critical criminology. Ian Taylor, Jock Young and Paul Walton wrote the groundbreaking "The New Criminology" in 1973, following that with the edited collection, "Critical Criminology", in 1975 writing on the need for a marxist, "fully social" theory of deviance. Whereas those around Stuart Hall, at the Birmingham Centre for Contemporary Cultural Studies focussed on "sub-cultures of imagination and resistance". David Downes and Paul Rock put forward an interactionist approach in response to the neo-marxists in their 1979 compilation, Deviant Interpretations.