Douglas Walton is professor of philosophy at the University of Winnipeg. The recipient of numerous fellowships, awards and honors, he is the author of over thirty books, most recently Fundamentals of Critical Argumentation, Media Argumentation, and Witness Testimony Evidence.

Chris Reed is senior lecturer and head of research at the School of Computing, University of Dundee. He is the head of the Argumentation Research Group at Dundee, which has been instrumental in the development of the Argument Interchange Format, an international standard for computational work in the area.

Fabrizio Macagno is completing his doctorate in linguistics at the Universita Cattolica del Sacro Cuore, Milan.