Manager (with Rasmus Rendsvig) of the Logic and Rational Interaction web portal (loriweb.org).

Editor (with Alexandru Baltag, Alexandry Marcoci, Ben Rodenhaeuser and Sonja Smets) of the LIRA Yearbook 2011

PC: AAMAS'12, KR'12, ECAI'12, COMMA'12

Manager (with Rasmus Rendsvig) of the Logic and Rational Interaction web portal (loriweb.org).

Organizer (with Stefan Minica, Ben Rodenhaeuser and Sonja Smets) of the Amsterdam-Groningen seminar on Logic and Interactive RAtionality (LIRA).

Editor (with Stefan Minica, Ben Rodenhaeuser and Sonja Smets) of the LIRA Yearbook 2010

Editor (with Morgan Mameni) of the 12th edition of the ILLC magazine.

PC: AAMAS'11, IJCAI'11, CLIMA XII, Jurix'11

Organizer (with Cedric Degremont and Stefan Minica) of the ILLC seminar on Logic and Interactive RAtionality (LIRA).

Organizer (with Harko Verhagen and Paul Davidsson) of the 5th International Workshop on Normative Multiagent Systems, NorMAS'10, Leicester, UK.

Organizer (with Leon van der Torre, Jan Broersen and Paolo Turrini) of the workshop Formal Models of Norm Change 2, Amsterdam, NL.

PC: AAMAS'10, NMR'10 Workshop on Preferences and Norms, NorMAS'10 (Chair), ECAI'10, CLIMA XI, DEON'10.

Organizer (with Lena Kurzen and Fernando Velazquez-Quesada) of the ILLC seminar on Logic and Interactive RAtionality (LIRA).

Local organizer of the International Symposium on Games, Argumentation and Logic Programming, GALP'09, University of Luxembourg, Luxembourg

PC: AAMAS'09, NorMAS'09, ESAW'09, LMSC'09

Local organizer of the Ninth International Conference on Deontic Logic in Computer Science, DEON'08, Luxembourg University, Luxembourg

Creator of the Deontic Logic Wiki, with Sebastien Varrette

PC: MICAI'08, NorMAS'08

Local organizer of the ICS/SIKS International Symposium on Artificial Normative Systems, ANS'07, Utrecht University, the Netherlands

Local organizer of the Eighth International Conference on Deontic Logic in Computer Science, DEON'06, Utrecht University, The Netherlands

Local organizer of  the Fourth International Joint Conference on Autonomous Agent and Multi-Agent Systems, AAMAS'05, Utrecht University, The Netherlands