He authored over 100 refereed publications areas of AI including autonomous agents and multi-agent systems, computational logics, logic programming, abductive reasoning, negotiation, dialogue, argumentation, and applications. He has been programme committee member of more than 100 events, and has an editorial record with several international journals and book series, including Fundamenta Informaticae, Journal of Logic and Computation, Argument & Computation, and Springer LNCS. He organized several editions of the DALT, CLIMA, ArgNMR and LADS workshops and two PhD spring schools.