Gaston Bachelard (French: [ba?la?]; 27 June 1884 – 16 October 1962) was a French philosopher. He made contributions in the fields of poetics and the philosophy of science. To the latter he introduced the concepts of epistemological obstacle and epistemological break (obstacle épistémologique and rupture épistémologique). He influenced many subsequent French philosophers, among them Michel Foucault, Louis Althusser, Dominique Lecourt and Jacques Derrida, as well as the sociologist Pierre Bourdieu.