Guy Ernest Debord (December 28, 1931 - November 30, 1994) was a French Marxist theorist, writer, filmmaker, hypergraphist and founding member of the groups Lettrist International and Situationist International (SI). He was also briefly a member of Socialisme ou Barbarie.
In broad terms, Debord's theories attempted to account for the spiritually debilitating modernisation of both the private and public spheres of everyday life by economic forces during the post-WW2 modernisation of Europe. He rejected as the twin faces of the same problem both capitalism of the West and the statism of the Eastern bloc. Alienation, Debord postulated, could be accounted for by the invasive forces of the 'spectacle' - "a social relation between people that is mediated by images".