In his book, "Amusing Ourselves to Death" : Public Discourse in the Age of Show Business Postman argued that by expressing ideas through visual imagery, television reduces politics, news, history and other serious topics to entertainment. He worried that culture would decline if the people became an audience and their public business a "vaudeville act". Read the excerpt of the book's forward
Neil Postman (1931 - 2003) was an American critic educator and Author. In addition to Amusing ourselves to Death, Postman wrote several other books as well as magazine and newspaper articles regarding technology and education. His other books include Conscientious Objections (1988), Technopoly: The Surrender of Culture to Technology (1992), The Disappearance of Childhood (1982) and The End of Education: Redefining the Value of School (1995).
His interests were were very diverse. He wrote on the disappearance of childhood, reforming public education, postmodernism, semantics, inguistics, and technopolies.
Sources: Wikipedia, NeilPostman.org