His research interest include argument schemes, fallacies and political argumentation. In 2009 he published a monograph on empirical research of the conventional validity of the pragma-dialectical discussion rules together with Frans van Eemeren and Bert Meuffels. Together with Frans van Eemeren, Erik Krabbe, Francisca Snoeck Henkemans, Bart Verheij and Jean Wagemans, Bart Garssen wrote the Handbook of Argumentation Theory (Springer, 2014). He is editor of the Journal of Argumentation in Context (Benjamins) and book review editor of Argumentation (Springer).