John Charles Turner (7 September 1947 – 24 July 2011)[1] was a British social psychologist who, along with colleagues, developed the self-categorization theory.
He gained experience as a Trades Union Organizer and experienced the importance of groups in terms of achieving social change.
During the 1970s, Turner was a lecturer in social psychology at the University of Bristol and during 1982 he was a scholar at the Institute for Advanced Study in Princeton.
Turner established a Laboratory of Experimental Social Psychology, which gave him the chance to publish books and articles with colleagues.
Turner's theory is important to social psychology because it gives specific details on the power groups have and how it changes a person's identity.