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     Harold Adams Innis (November 5, 1894 – November 8, 1952) was a professor of political economy at the University of Toronto and the author of seminal works on Canadian economic history and on media and communication theory. He helped develop the staples thesis, which holds that Canada's culture, political history and economy have been decisively influenced by the exploitation and export of a series of staples such as fur, fish, wood, wheat, mined metals and fossil fuels. Innis's communications writings explore the role of media in shaping the culture and development of civilizations. He argued, for example, that a balance between oral and written forms of communication contributed to the flourishing of Greek civilization in the 5th century BC. But he warned that Western civilization is now imperiled by powerful, advertising-driven media obsessed by "present-mindedness" and the "continuous, systematic, ruthless destruction of elements of permanence essential to cultural activity."