"Madness and Civilization" (1961) postulated that conceptions of madness and what was considered "reason" or "knowledge" was itself subject to major culture bias – in this respect mirroring similar criticisms by Thomas Szasz, at the time the foremost critic of psychiatry, and himself now an eminent psychiatrist.A point where Foucault and Szasz agreed was that sociological processes played the major role in defining "madness" as an "illness" and prescribing "cures".