Duncan Bowen Black (born February 18, 1972), better known by his pseudonym Atrios /ˈeɪtri.oʊs/, is an American liberal blogger living in Philadelphia. His weblog is called Eschaton. Black was also a regular guest economics expert on Air America Radio's The Majority Report and is currently a regular commentator on Sam Seder's internet radio (Majority.fm) Majority Report and an op-ed contributor to USA Today.