in which university did he teach?
University of Toronto.
Harold Innis
Harold Adams Innis (1894 – 1952) was a Canadian professor of political economy at the University of Toronto and the author of seminal works on media, communication theory, and Canadian economic history. 
who was harold innis? He was a professor and an author. what subjects did he teach? Political economy.
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Harold Innis [SEP] Introduction
Harold Adams Innis (1894 – 1952) was a Canadian professor of political economy at the University of Toronto and the author of seminal works on media, communication theory, and Canadian economic history. 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, fishing, lumber, wheat, mined metals, and coal. The staple thesis dominated economic history in Canada from the 1930s to 1960s, and continues to be a fundamental part of the Canadian political economic tradition. Innis's writings on communication explore the role of media in shaping the culture and development of civilizations.