His most important works include Argumentation and the Social Grounds of Knowledge and A Theory of Argumentation. He has published monographs in and served on editorial boards for Communication Monographs, Informal Logic, Journal of the American Forensics Association, Argumentation, Social Epistemology and the Quarterly Journal of Speech. He has published more than 50 articles and book chapters on topics in rhetoric and argumentation. He was one of the founders and for many years was a co-director of the International Association for the Study of Argumentation based at the University of Amsterdam in the Netherlands. He has co-edited the proceedings of five of that organization's international conferences. He has recently co-edited with Frans van Eemeren, J. Anthony Blair, and A. Francisca Henkemans Anyone Who Has A View: Theoretical Contributions to the Study of Argumentation. Dordrecht: Kluwer. 2003. He has received distinguished scholarship awards from the National Communication Association, the American Forensics Association, and the Universities of Illinois and Louisville. Four of his books have received the Daniel H. Rohor Distinguished Scholarship Award from the American Forensic Association. His Liberalism and the Problem of Knowledge: A New Rhetoric for Modern Democracy debunks the discourse of liberalism, arguing that its exaggerated ideals of authenticity, unity, and community have deflected attention from the pervasive incompetence of the rule by experts. He proposes a ground of communication that emphasizes common interests rather than narrow disputes.
2004 — Critical problems in Argumentation: Proceedings of the Thirteenth NCA/AFA Conference on Argumentation, Washington, DC: National Communication Association
"Argument," in Theresa Enos, Ed., Encyclopedia of Rhetoric and Composition. New York: Garland, 1996, pp. 16–26.
"L'Argumentation et les Fondements Sociaux de la Connaissance," in Alain Lempereur, ed. L'Argumentation. Liege: Pierre Mardaga, 1992.
"The Problem of the Public Sphere: Three Diagnoses," in David Cratis Williams and Michael David Hazen, eds., Argumentation Theory and the Rhetoric of Assent. Tuscaloosa: University of Alabama Press, 1990.
"Argumentation and Postmodern Critique," in J. Schuetz and R. Trapp, eds., Perspectives on Argument. Waveland, 1990.
"Argument Fields: A Cartesian Meditation," in George Ziegelmueller and Jack Rhodes, eds., Dimensions of Argument: Proceedings of the Second S.C.A./A.F.A. Summer Conference on Argumentation.
"On the Utility of Descriptive Diagrams for the Analysis and Criticism of Argument," Communication Monographs, 64, 308-319.
