Editorial Boards

• Artificial Intelligence and Law; Springer Verlag; Heidelberg (1992-2015)
• Argument and Computation; IOS Press; Amsterdam
• Artificial Intelligence Dissertations (DISKI) Akademische Verlagsgesellschaft (AKA); Berlin
• Encyclopedia of Digital Government; Idea Group
• IfColog Journal of Logics and their Applications

Associations

• Vice President; International Association for Artificial Intelligence and Law (IAAIL), 2004-2006.
• President; International Association for Artificial Intelligence and Law (IAAIL), 2006-2008.
• Vice President; Steering Committee of the Computational Models of Argument (COMMA) conference; 2008-2010.
• Stv. Sprecher; Fachbereich Informatik in Recht und Öffentlicher Verwaltung der Gesellschaft für Informaik, 2011?-2015.

Program Chair

• GI Workshop on Cooperative Legal Information Systems, Vienna, September, 1994
• AAAI-94 workshop on Computational Dialectics, Seattle, Wasington, 1994.
• Workshop on Computational Dialectics; Conference on Fundamentals of Applied and Practical Reasoning (FAPR-96); Bonn, 1996.
• International Conference on Artificial Intelligence and Law (ICAIL-99); University of Oslo, Norway; 1999
• 17th Annual Conference on Legal Knowledge and Information Systems (Jurix 2004); Berlin, Germany; 8-10 December 2004.
• French-German Symposion on Governance, Law, and Technology; New Instruments of Governance in Europe; Ecole Nationale Supérieure des Arts et Métiers (ENSAM); Paris; 19-20 September 2005 (Co-Chair with Danielle Bourcier)

Program Committees

Argumentation

• International Conference on Computational Models of Argument (COMMA)
• Computational Models of Natural Argument (CMNA)
• European Conference on Argumentation (ECA)
• Theory and Applications of Formal Argumentation (TAFA)

AI and Law, eGovernment

• Legal Knowledge and Information Systems (JURIX)
• International Conference for AI and Law (ICAIL)
• International Legal Informatics Symposium (IRIS)
• Knowledge Management in Electronic Government
• Legal Information Systems (LIS)
• DEXA eGovernment Conference
• Conference on Knowledge Management in Electronic Government
• IFIP Conference on eCommerce, eBusiness and eGovernment
• International E-Government Conference (EGOV)
• Fachtagung für Rechtsinformatik und Verwaltungsinformatik (FTVI & FTRI)
• AI Approaches to the Complexity of Legal Systems Workshop (AICOL)
• Workshop on Juris-informatics (JURISIN)
• International Conference on Alternative Methods of Argumentation in Law

eParticipation and Online Dispute Resolution

• eDemocracy Workshop of the Informatik 2003 Conference of the German Society for Informatics
• International Workshop on Online Dispute Resolution
• Electronic Democracy Conference (EDem)
• International Conference on eParticipation (ePart)
• International Conference on Online Deliberation
• IADIS International Conference e-Democracy, Equity and Social Justice

Other

• Legislative XML Summer School
• RuleML
• International Joint Conference on Artificial Intelligence (IJCAI)