Hallin’s research concerns journalism, political communication, and the comparative analysis of media systems. He has written on the media and war, including Vietnam, Central America, and the Gulf War. He has written on television coverage of elections, demonstrating the shrinking «sound bite» and offering an interpretation of its meaning for political journalism, and on the rise and decline of journalist professionalism in the United States. In recent years, he has turned his attention to the comparative analysis of media systems, focusing on Western Europe and on Latin America, and trying to bring into political communication and media studies the tradition of comparative historical and institutional analysis that can be found in sociology and comparative politics. His bookComparing Media Systems: Three Models of Media and Politics, co-authored with Paolo Mancini, has won the Outstanding Book awards of the International Communication and National Communication Associations, and the Goldsmith Book Award of the Shorenstein Center on Press and Politics at Harvard. It has also been translated into nine languages. Most recently, Hallin has been doing research on health and medical reporting and the mediatization of health and medicine, working with the Berkeley Anthropologist Charles Briggs.