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Herbert Marshall McLuhan (July 21, 1911 - December 31, 1980) was a Canadian professor, philosopher, and public intellectual. His work is one of the cornerstones of the study of media theory. Born in Edmonton, Alberta, McLuhan studied at the University of Manitoba and the University of Cambridge. He began his teaching career as a professor of English at several universities in the U.S. and Canada before moving to the University of Toronto in 1946, where he remained for the rest of his life.

During his years at Saint Louis University (1937-1944), McLuhan worked concurrently on two projects: his doctoral dissertation and the manuscript that was eventually published in 1951 as the book The Mechanical Bride: Folklore of Industrial Man, which included only a representative selection of the materials that McLuhan had prepared for it. McLuhan's 1942 Cambridge University doctoral dissertation surveys the history of the verbal arts (grammar, logic, and rhetoric--collectively known as the trivium) from the time of Cicero down to the time of Thomas Nashe. In his later publications, McLuhan at times uses the Latin concept of the trivium to outline an orderly and systematic picture of certain periods in the history of Western culture. McLuhan suggests that the Middle Ages, for instance, was characterized by the heavy emphasis on the formal study of logic. The key development that led to the Renaissance was not the rediscovery of ancient texts but a shift in emphasis from the formal study of logic to rhetoric and language. Modern life is characterized by the re-emergence of grammar as its most salient feature--a trend McLuhan felt was exemplified by the New Criticism of Richards and Leavis. In The Mechanical Bride, McLuhan turned his attention to analysing and commenting on numerous examples of persuasion in contemporary popular culture. This followed naturally from his earlier work as both dialectic and rhetoric in the classical trivium aimed at persuasion. At this point his focus shifted dramatically, turning inward to study the influence of communication media independent of their content. His famous aphorism "the medium is the message" (elaborated in his 1964 book, Understanding Media: The Extensions of Man) calls attention to this intrinsic effect of communications media. McLuhan also started the journal Explorations with anthropologist Edmund "Ted" Carpenter. In a letter to Walter Ong dated May 31, 1953, McLuhan reported that he had received a two-year grant of $43,000 from the Ford Foundation to carry out a communication project at the University of Toronto involving faculty from different disciplines, which led to the creation of the journal. At a Fordham lecture in 1999, Tom Wolfe suggested that a major under-acknowledged influence on McLuhan's work is the Jesuit philosopher Pierre Teilhard de Chardin whose ideas anticipated those of McLuhan, especially the evolution of the human mind into the "noosphere". In fact, McLuhan warns against outright dismissing or whole-heartedly accepting de Chardin's observations early on in his first published book The Mechanical Bride (p. 32): "This externalization of our senses creates what de Chardin calls the 'noosphere' or a technological brain for the world. Instead of tending towards a vast Alexandrian library the world has become a computer, an electronic brain, exactly as in an infantile piece of science fiction. And as our senses have gone outside us, Big Brother goes inside. So, unless aware of this dynamic, we shall at once move into a phase of panic terrors, exactly befitting a small world of tribal drums, total interdependence, and super-imposed co-existence."
Marshall McLuhan