Marshall McLuhan (1911-1980) was a Canadian communication theorist, known for his groundbreaking work in media theory. He coined the famous phrase "The medium is the message," emphasizing the impact of communication technologies on society. McLuhan's ideas revolutionized the study of media and culture, influencing fields such as advertising, marketing, and literary theory. He published several influential books, including "Understanding Media: The Extensions of Man" and "The Gutenberg Galaxy." McLuhan's interdisciplinary approach and prophetic insights continue to inspire scholars and thinkers worldwide.