language appear obscure, esoteric, and mysterious to the layman. Marx In his early works, Karl Marx criticized German and French philosophy, especially German Idealism, for its traditions of German irrationalism and ideologically motivated obscurantism. Later thinkers whom he influenced, such as the philosopher György Lukács and social theorist Jürgen Habermas, followed with similar arguments of their own. However, philosophers such as Karl Popper and Friedrich Hayek in turn criticized Marx and Marxist philosophy as obscurantist (however, see above for Hayek's particular interpretation of the term). Heidegger Martin Heidegger, and those influenced by him, such as Jacques Derrida and Emmanuel Levinas, have been labeled obscurantists by critics from analytic philosophy and the Frankfurt School of critical theory. Of Heidegger, Bertrand Russell wrote: "his philosophy is extremely obscure. One cannot help suspecting that language is here running riot. An interesting point in his speculations is the insistence that nothingness is something positive. As with much else in Existentialism, this is a psychological observation made to pass for logic." That is Russell's complete entry on Heidegger, and it expresses the sentiments of many 20th-century analytic philosophers concerning Heidegger. Derrida In their obituaries "Jacques Derrida, Abstruse Theorist, Dies at 74" (10 October 2004) and "Obituary of Jacques Derrida, French intellectual" (21 October 2004), The New York Times newspaper and The Economist magazine described Derrida as a deliberately obscure philosopher. In Contingency, Irony, and Solidarity (1989), Richard Rorty proposed that in The Post Card: From Socrates to Freud and Beyond (1978), Jacques Derrida purposefully used undefinable words (e.g. différance) and used defined words in contexts so diverse that they render the words unintelligible, hence, the reader is unable to establish a context for his literary self. In that way, the philosopher Derrida escapes metaphysical accounts of his work. Since the work ostensibly contains no metaphysics, Derrida has, consequently, escaped metaphysics. Derrida's philosophic work is especially controversial among American and British academics, as when the University of Cambridge awarded him an honorary doctorate, despite opposition from among the Cambridge philosophy faculty and analytical philosophers worldwide. In opposing the decision, philosophers including Barry Smith, W. V. O. Quine, David Armstrong, Ruth Barcan Marcus, René Thom, and twelve others, published a letter of protestation in The Times of London, arguing that "his works employ a written style that defies comprehension ... [thus] Academic status based on what seems to us to be little more than semi-intelligible attacks upon