Kathleen Hall Jamieson, professor of communication at the University of Pennsylvania's Annenberg School for Communication, authored 15 books on poitical communication. With her colleague Karlyn Kohrs Campbell, she wrote The Interplay of Influence, a media literacy textbook that explores how the mass media operate in our society and the profound ramifications of media messages in the areas of politics, news, and advertising. Another book, UnSpun: Finding Facts in a World of Disinformation, written with Brooks Jackson, offers insight on the relationship between facts, information and opinion.