John Zerzan has been active in anarchist circles for some time and has done his weekly Anarchy Radio broadcasts for the past 15 years. Books are Elements of Refusal, Future Primitive, Running on Emptiness, Against Civilization, Twilight of the Machines, and Future Primitive Revisited. This fall his Why Hope? will appear. He's spoken widely since 2001 from an anarcho-primitivist/green anarchy/civilization critique perspective.