Emerging in French intellectual life in the late 1960s and early 1970s, post-structuralism embraced Jacques Derrida's deconstructionism and the later work of Roland Barthes, the psychoanalytic theories of Jacques Lacan and Julia Kristeva （b. 1941）, the historical critiques of Michel Foucault, and the writings of Jean-François Lyotard and Jean Baudrillard. It departed from the claims to objectivity and comprehensiveness made by structuralism and emphasized instead plurality and deferral of meaning, rejecting the fixed binary oppositions of structuralism and the validity of authorial authority.