My main research interests lie in multi-agent systems and symbolic AI. I investigate individual and collective decision-making and develop formal approaches to their representation. In particular, I am interested in generalising existing frameworks for individual agent reasoning to their collective counterpart, in the study and representation of the interactions between agents in a group, and in the definition of feasible aggregation procedures. Topics I contribute to include argumentation theory, judgment aggregation, computational social choice, and normative multi-agent systems.


Doctoral Supervision

  • Marija Slavkovik (2008-2011, University of Luxembourg), "Judgment aggregation for multi-agent systems” (with L. van der Torre).
  • Nicolas Paget (2012- 2016, Université Paris-Dauphine), “Facing threats by sharing information for renewable natural resources management” (with A. Tsoukiàs and O. Barreteau).
  • George Butler (started October 2017, Université Paris-Dauphine), “Les Corses avaient-ils raison ? La théorie de l’argumentation et la simulation agents comme aides à l’analyse d’un conflit environnemental et des dynamiques politiques à plusieurs échelles” (with J. Rouchier).
  • Louise Dupuis de Tarlé (started November 2021, Université Paris-Dauphine), “Analyzing the interactions between spaces of argumentation in different contexts” (with J. Rouchier).


Invited Talks (since 2014)

  • “Spaces of argumentation and their interaction: the role of media in public discussion” (with D. Gabbay and J. Rouchier) at the workshop Meaningful, Useful and Legitimate Information in Decision Making, Université Paris Dauphine, Paris, France, December 2023.
  • “An agent-based model of myside bias in scientific debates” at the workshop Reasoning with imperfect information, Scuola Normale Superiore di Pisa, Italy, October 2023.
  • “Argumentation spaces: Two case studies (and a first model)” at the workshop on Reasoning about responsible agency in AI, Institute for Logic, Language and Computation (ILLC), University of Amsterdam, The Netherlands, May 2023.
  • “Judgment aggregation. An overview on a logical aggregation problem, from impossibility results to feasible rules” at the Linz Seminar “Many-Valued Logic: Theory and Applications”, Linz, Austria, June 2022.
  • “Spaces of argumentation and their interaction: Some elements of thought inspired by controversies and dispute in France during the Covid-19 crisis” at the conference Aggregation across disciplines: connections and frameworks, Maison International de la Recherche, CY Institute for Advanced Studies, Neuville-sur-Oise, France, December 2021.
  • “Spaces of argumentation and their interaction” at the 3rd International Conference on Logic and Argumentation (CLAR 2020), Hangzhou, China, April 2020. (Cancelled due to Covid-19 and postponed to July 2021 online)
  • “An opinion diffusion model with deliberation” at the Workshop on Nonclassical Logics and Judgment Aggregation, Academy of Sciences, Prague, Czech Republic, November 2019.
  • “An opinion diffusion model with deliberation” at the Workshop in Knowledge Representation and Collective Decision Making, Institut de Recherche en Informatique de Toulouse (IRIT) and the University Toulouse 1 Capitole, Toulouse, France, November 2019.
  • “Mixing dyadic and deliberative opinion dynamics in an agent-based model of group decision-making” at the SEGA Final Project Meeting, Bayreuth, Germany, July 2019.
  • “Group argument evaluation” at the Research Seminar of the Logic Group at the Department of Philosophy, University of Milan (Italy), May 2019.
  • “Changing norms” at the workshop Logic In Bochum III, Ruhr University Bochum, Germany, May 2017.
  • Tutorial “The logic of group decision: An introduction to judgment aggregation” at the Conference PhDs in Logic IX, Ruhr University Bochum, Germany, May 2017.
  • “Changing norms” at the 13th International Conference on Deontic Logic and Normative Systems (DEON), Bayreuth, Germany, July 2016.
  • “Compatible Group Decisions” at the International Symposium on Aggregation and Structures (ISAS), Luxembourg, July 2016.
  • “A framework for revising and contracting rules” at the von Wright Centenary Symposium, Helsinki, May 2016.
  • “A framework for norm change”, keynote speaker at Trends in Logic XV: Logics for Social Behaviour, Delft University of Technology, the Netherlands, June 2015.
  • “A framework for norm change”, at the seminar Décision, Rationalité & Interaction, Institut d’Histoire et de Philosophie des Sciences et des Techniques, Paris, France, April 2015.
  • “A tutorial on Judgment Aggregation” (with D. Grossi), Logics for Social Behaviour workshop, Lorentz Center, November 2014.
  • “Group Argumentation”, Graphs and Decisions, University of Luxembourg, 27-29 October 2014.
  • “Logic in Group Decisions”, Trends in Logic XIV: The Road Less Travelled O ff -stream applications of formal methods, Ghent University, Belgium, July 8-11, 2014.
  • “Judgment aggregation and argumentation theory”, Séminaire de Logiques non-Classiques, Université Paris 1 Panthéon - Sorbonne, IHPST - Institut d’histoire et de philosophie des sciences et des techniques, Paris, France, 10 April 2014.




Contributed Talks (since 2010)

  • “Exploring Opinion Diversity and Epistemic Success with an Argumentative Model” (with L. Dupuis de Tarlé and J. Rouchier, talk given by L. Dupuis de Tarlé) at the 18th Social Simulation Conference, University of Glasgow, UK, September 2023 (Best Paper Award).
  • “Modelling the Diffusion of Scientific Argumentation” (with L. Dupuis de Tarlé and J. Rouchier, talk given by L. Dupuis de Tarlé) at the Agent-Based Models of Epistemic Communities workshop, Ruhr-University Bochum, Germany, February 2023.
  • “What is the Impact of MySide Bias on Scientific Debates ?” (with L. Dupuis de Tarlé, M. Michelini, A. Borg, J. Rouchier, D. Seselja and C. Strasser (talk given by L. Dupuis de Tarlé), Truth and Politics: A Political Epistemology Conference, University of Bamberg, Germany, August 2022.
  • “Diffusion of Scientific Argumentation” (with L. Dupuis de Tarlé and J. Rouchier, talk given by L. Dupuis de Tarlé), Formal Models of Democracy, Rotterdam, The Netherlands, April 2022.
  • “Arguing about constitutive and regulative norms” (with L. van der Torre), Argument Strength Workshop, Ruhr University Bochum, Germany, November 2016.
  • “Argumentation and group decisions”, Collective Intentionality X, The Hague, The Netherlands, August 2016.
  • “Argumentation theory for public policy” (with N. Paget), Twenty-sixth European Conference on Operational Research (EURO XXVI), Rome, Italy, 1-4 July 2013.
  • “Group intentions are social choice with commitment” (with G. Boella, M. Slavkovik and L. van der Torre), at the 8th European Workshop on Multi-Agent Systems (EUMAS), Paris, France, December 16-17, 2010.
  • “Manipulation in group argument evaluation” (with M. Caminada and M. Podlaszewski), at the 8th European Workshop on Multi-Agent Systems (EUMAS), Paris, France, December 16-17, 2010.