Dennis' earliest books chronicled the rise of
New Journalism, first in
The Magic Writing Machine and subsequently in
Other Voices: The New Journalism in America, followed by books on news reporting and a study of
Justice Hugo Black and the First Amendment. Known for multiple editions of the text,
Understanding Mass Communication with co-author Melvin L. DeFleur and
Media Debates with John C. Merrill, he authored and edited several books on the critical intersections of contemporary media with their broader societal impacts. He also founded the
Media Studies Journal (formerly
Gannett Center Journal) at Columbia and served as its editor-in-chief for a decade. In
Media and Public Life, he offered a retrospective of influential essays from the
Media Studies Journal, exploring the global role of media. Michael Antecol praised the book's command of diverse topics, underscoring the stature of the ideas explored in the
American Journalism Review. Dennis' synthetic writing brought together such studies as
The Cost of Libel and others assessing the state of media law and ethics. He edited
Media and the Environment, which explored how media delivers
environmental reporting to enhance
public comprehension of scientific issues. Steve Nash commented that the book "offers telling insights on how the news media filter information about accelerating environmental ruin." In
Beyond the Cold War, he analyzed mutual images between the US and the former Soviet Union, examining the media's role in shaping perceptions during and after the
Cold War. Brian Thomas's review in
International Affairs highlighted the book's exploration of Cold War propaganda and its implications for the changing role of media in shaping international perceptions. == Awards and honors ==