French philosopher and social theorist Michel Foucault first discussed his thoughts on biopolitics in his lecture series "Society Must Be Defended" given at the Collège de France from 1975 to 1976. Foucault's concept of biopolitics is largely derived from his own notion of biopower, and the extension of state power over both the physical and political bodies of a population. While only mentioned briefly in his "Society Must Be Defended" lectures, the conceptualisation of biopolitics developed by Foucault has become prominent in social science and the humanities.