1942 – 2019
Douglas Walton (1942–2019) was a Canadian philosopher and leading theorist in informal logic, argumentation theory, and dialogue theory. He developed systematic frameworks for analyzing argument schemes, fallacies, and the role of dialogue in rational discourse. His work bridged philosophy, rhetoric, artificial intelligence, and legal reasoning.
Developed a comprehensive taxonomy of argument schemes with associated critical questions
Pioneered dialogue theory as a formal framework for classifying types of argumentative discourse
Produced influential systematic treatments of informal fallacies grounding them in dialogue context
Applied argumentation theory to legal reasoning, AI, and burden-of-proof analysis
Authored over 50 books advancing informal logic as a rigorous philosophical discipline