Graeber is a well-known American anthropologist and social activist. PhD at the University of Chicago in 1996, he was professor of anthropology at Yale University, until the prestigious university took the controversial decision not to renew his contract in June 2007. Since then he is a professor in the Department of Anthropology at Goldsmiths College , University of London. With a long history of political and social activism, including a prominent role in the protests against the World Economic Forum in New York City (2002), Graeber is a member of the Industrial Workers of the World trade union and one of the leaders of the movement Occupy Wall Street. He is the author of renowned essays, such as Towards an anthropological theory of value, Possibilities: essays on hierarchy, rebellion and desire, or the international bestseller En Deuda: an alternative history of economics, in which he is responsible for dismantling some of the myths defended since centuries by the theorists of the Economy, as those that have to do with the emergence of barter and money. He also writes articles for Harpers, The Nation, Mute and The New Left Review.