This thinker discusses the ambivalence of "pharmakon" in an essay on Phaedrus, "Plato's Pharmacy." The two columns of another of this philosopher's works juxtapose a dissection of Hegel with a celebration of Jean Genet's writings. He called for resistance to the "ontologization" of Marx through a "New International." This author of Glas caused a sensation at a Johns Hopkins conference with his paper (*) "Structure, Sign, and Play." This author of Specters of Marx denoted a form of language prefiguring both speech and writing as "arche-writing," enlisting it in his critique of logocentrism. In Speech and Phenomena, he critiqued Husserl's "metaphysics of presence" through the notion of différance. For 10 points, name 
This thinker discusses the ambivalence of "pharmakon" in an essay on Phaedrus, "Plato's Pharmacy." The two columns of another of this philosopher's works juxtapose a dissection of Hegel with a celebration of Jean Genet's writings. He called for resistance to the "ontologization" of Marx through a "New International." This author of Glas caused a sensation at a Johns Hopkins conference with his paper (*) "Structure, Sign, and Play." This author of Specters of Marx denoted a form of language prefiguring both speech and writing as "arche-writing," enlisting it in his critique of logocentrism. In Speech and Phenomena, he critiqued Husserl's "metaphysics of presence" through the notion of différance. For 10 points, name this Algerian-born French philosopher who wrote Of Grammatology and developed deconstruction.
This thinker discusses the ambivalence of "pharmakon" in an essay on Phaedrus, "Plato's Pharmacy.
Jacques Derrida