George Caffentzis (New York, 1945) is a philosopher, professor and militant. The area of interest of him as academic is the philosophy of money and the philosophy of science and technology. As a militant, being still a student, he participated from the movement for civil rights and protests against the Vietnam War. Next to his companion Silvia Federici, Peter Linebaugh and other colleagues, he founded Midnight Notes Collective, with whom he wrote and published a large part of his political research work. In the eighties, being a professor at Nigeria, he was coordinator of the Committee for Academic Freedom in Africa (CAFA). For thirty years he was a professor of philosophy at the University of Southern Maine. Between the books of it, Clipped Coins, Abused Words and Civil Government stand out: John Locke's Philosophy of Money (1989); Exciting The Industry of Mankind: George Berkeley's Philosophy of Money (2000); Auroras of the Zapatistas: Local and Global STRUGGLES IN THE FOURTH WORLD WAR (2001); And not Blood for Oil! Essays on Energy, Class Struggle, and War (2017); The limits of capital. Debt, currency and class struggle (lemon ink, 2018).