This document provides brief biographies of influential thinkers Sigmund Freud, Jacques Derrida, Michel Foucault, Mikhail Bakhtin, Friedrich Nietzsche, and Karl Marx. It outlines some of their major works and key concepts. Freud is known for his work on dreams and the unconscious. Derrida developed deconstruction to challenge structuralism. Foucault examined discourse and power relations. Bakhtin analyzed dialogism and carnival. Nietzsche wrote about the Übermensch. Marx developed theories of class struggle and capitalism.