French historian and philosopher whose work reshaped the humanities and social sciences in the late 20th century. Foucault is easy to parody — the prophet of "power/knowledge," the endless genealogist, the man who declared the death of Man — but the underlying project is coherent: to show how the categories through which we understand ourselves (madness, criminality, sexuality, the self, the human) are not timeless givens but historical productions tied to specific configurations of power.
His early archaeological works (Madness and Civilization, 1961; The Order of Things, 1966) traced the silent rules — epistemes — that make knowledge possible within a given period. His middle genealogical period turned more sharply political. Discipline and Punish (1975) described the emergence in the 18th–19th centuries of a new kind of power: not the old sovereign's spectacular right to kill, but a dispersed, productive, normalizing power that constructs "docile bodies" through surveillance, timetables, examinations, and the soft totalitarianism of the prison, the school, the hospital, the barracks. The figure of Bentham's Panopticon looms large.
The first volume of The History of Sexuality (1976) extended this to the self: modern sexuality, he argued, is not a liberation from Victorian repression but the product of a vast incitement to confess, classify, and discourse about sex. His late work turned toward ancient ethics and "technologies of the self" — practices through which one might shape oneself against power's grain.
Foucault is controversial on any reading, but his vocabulary — power/knowledge, discipline, biopolitics, normalization, genealogy, discourse — is now simply part of how the humanities think.