- Editorial Board; Artificial Intelligence and Law; Springer Verlag; Heidelberg; 1992 to present
- Vice Chairman; Special Interest Group 6.1.2; Formalization and Expert Systems in Law; German Association for Computer Science (GI), 1992 to 2004.
- Executive Committee; International Association for Artificial Intelligence and Law (IAAIL), 1994-1997, 2000-2003
- Co-chair; AAAI-94 workshop on Computational Dialectics
- Program Chair; GI Workshop on Cooperative Legal Information Systems, Vienna, September, 1994
- Program Chair; Workshop on Computational Dialectics; Conference on Fundamentals of Applied and Practical Reasoning (FAPR-96); Bonn, 1996.
- Program Committee; 10th Annual Conference on Legal Knowledge and Information Systems (JURIX 1997); Amsterdam, The Netherlands; 12 December 2000.
- Program Chair; International Conference on Artificial Intelligence and Law (ICAIL-99); University of Oslo, Norway; 1999
- European Chairman; IFIP Working Group 8.5; Information Systems in Public Administration; 1998-2002
- External Reviewer; 13th Annual Conference on Legal Knowledge and Information Systems (JURIX 2000); Enschede, The Netherlands; 14-15 December 2000.
- Executive Committee; FA 6.2 of the German Informatics Association; Informatics and Public Administration; 2001-2004.
- Executive Committee; FA 6.1 of the German Informatics Association; Legal Informatics and Information Law
- Editor, ERCIM News No. 48 (January 2001), Special Theme: Electronic Government
- Program Committee; International Legal Informatics Symposium 2003 (IRIS 2003); 20-22 February 2003; Salzburg, Austria
- Program Commitee; Online Mediation Symposium; Sankt Augustin, Germany; 21 February 2003
- Program Committee; Knowledge Management in Electronic Government (KMGov 2003); 26-28 May 2003; Greece
- Program Committee; Legal Information Systems (LIS 2003); Special Session in Conjunction with the 6th International Conference On Business Information (Bis 2003); Colorado Springs, Colorado, USA; June 4-6, 2003
- Program Committee; International Conference for Artificial Intelligence and Law (ICAIL 2003); Edinburgh, Scottland; June, 2003.
- Program Committee; Online Dispute Resolution Workshop of the International Conference for Artificial Intelligence and Law (ICAIL 2003); Edinburgh, Scottland; June, 2003.
- Program Committee; Second DEXA eGovernment Conference (EGOV 2003); Prague, Czech Republic; 1-5 September 2003.
- Program Committee; 4th Annual International Conference on Object-Oriented and Internet-based Technologies, Concepts, and Applications for a Networked World (Net.ObjectDays 2003); Erfurt, Germany; 22-25 September 2003.
- Program Committe; eDemocracy Workshop of the Informatik 2003 Conference of the German Society for Informatics (GI - Gesellschaft für Informatik); Frankfurt am Main, Germany; 29 Sep. - 02 Oct., 2003.
- Vice President; International Association for Artificial Intelligence and Law (IAAIL), 2004-2006.
- Program Committee; 16th Annual Conference on Legal Knowledge and Information Systems (JURIX 2003); Utrecht, The Netherlands; 11-12 December 2003.
- Organizing Committee; International Workshop on the Development of Standards for Describing Legal Documents; Utrecht, The Netherlands; 11 December 2003.
- Co-chair; Workshop on AI to Support eGovernment; 23rd Annual International Conference of the BCS Specialist Group on Artificial Intelligence; Cambridge, UK; 15-17 December 2003.
- Program Committee; 5th Working Conference on Knowledge Management in Electronic Government (KMGov 2004); Krems, Austria; 17-18 May; 2004.
- Program Committee; International Legal Informatics Symposium 2004 (IRIS 2004); Salzburg, Austria; 26-28 February 2004.
- Program Committee; EU-Lat Workshop on eGovernment and eDemocracy; Santiago, Chile; 24-27 May 2004.
- Program Committee; 4th Workshop on Computational Models of Natural Argument (CMNA4); 16th European Conference on Artificial Intelligence (ECAI 2004); Valencia, Spain; 22-27 August, 2004.
- Reviewer; Special Issue on Computational Models of Natural Argument of the International Journal of
- Intelligent Systems (IJIS); 2004.
- Program Committee; Fourth IFIP Conference on eCommerce, eBusiness and eGovernment; IFIP World Computer Congress; Toulouse, France; 22-27 August 2004.
- Program Chair; 17th Annual Conference on Legal Knowledge and Information Systems (Jurix 2004); Berlin, Germany; 8-10 December 2004.
- Program Committee; International Legal Informatics Symposium 2005 (IRIS 2005); Salzburg, Austria; 24-26 February 2005.
- Program Committee; 10th International Conference on Artificial Intelligence and Law (ICAIL 05); Bologna; 6-10 June, 2005.
- Program Committee; 5th Workshop on Computational Models of Natural Argument (CMNA5); International Joint Conference on Artficial Intelligence (IJCAI 2005); Edinburgh; 30 July - 5 August, 2005.
- President; International Association for Artificial Intelligence and Law (IAAIL), 2006-2008.
- Program Committee; DEXA eGovernment Conference (EGOV 2005); Copenhagen, Denmark; 22-26 August 2005.
- Co-Chair; 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;
- Program Committee; Jurix 2005 Conference on Legal Knowledge Systems; Brussels, Belgium; 8-10 December 2005.
- Program Committee; Jurix 2005 Workshop on Online Dispute Resolution; Brussels, Belgium; 10 December 2005.
- Program Committee; International Legal Informatics Symposium (IRIS 2006); Vienna, Austria; 16-18 February 2006.
- Program Committee; First International Conference on Computational Models of Argument (COMMA06); Liverpool, UK; September, 2006.
- Program Committee; Special Session on Argument, Dialogue and Decision of the Eleventh International Workshop on Non-Montonic Reasoning; Lake District, England; 30 May - 1 June 2006.
- Program Committee; 6th Workshop on Computational Models of Natural Argument (CMNA6); 17th European Conference on Artificial Intelligence (ECAI 2006); Riva del Garda, Italy; 28 August, 2006.
- Editorial Board; Artificial Intelligence Dissertations (DISKI); Akademische Verlagsgesellschaft (AKA); Berlin; 2006 to present.
- Program Committee; 11th International Conference on Artificial Intelligence and Law (ICAIL 07); Palo Alto, California; June, 2007.
- Program Committee; Fourth International Workshop on Online Dispute Resolution; Palo Alto, California; June, 2007.
- Program Committee; 3. eDemo-Workshop: Sozio-technische Infrastrukturen für demokratische Prozesse: Praxis und Perspektiven; Informatik 2006; Technische Universität Dresden; 5-6 Oktober 2006.
- Program Committee; Jurix 2006 Conference on Legal Knowledge Systems; Paris, France; 7-9 December 2006.
- Program Committee; 7th Workshop on Computational Models of Natural Argument (CMNA7); International Joint Conference on Artificial Intelligence (IJCAI); Hyberabad, India; January, 2007.
- Editorial Board; Encyclopedia of Digital Government; Idea Group; 2006.
- Scientific Advisory Board; European IT Academy of Law (Europäische EDV-Akademie des Rechts, EEAR); 2007-2010.
- Program Committee; 2nd International Pragmatic Web Conference; Tilburg, The Netherlands; 22-23 October 2007.
- Program Committee; Sixth international EGOV conference 2007; Regensburg, Germany; 3-7 September 2007.
- Scientific Committee; Legislative XML Summer School; San Domenico di Fiesole (Florence, Italy); 10-15 September 2007.
- Program Committee; Jurix 2007 Conference on Legal Knowledge Systems; Leyden, The Netherlands; 12-15 December 2007.
- Executive Board; Department for Informatics in Law and Public Administration (FB RVI); German Society for Informatics (GI); 2008 to present.
- Program Committee; Second International Conference on Computational Models of Argument (COMMA 2008); RIT; Toulouse, France; May, 2008.
- Program Committee; Seventh International E-Government Conference (EGOV 2008); Torino, Italy; 1-5 September 2008.
- Program Committee; RuleML 2008; Orlando, Florida; October, 2008.
- Program Committee; Electronic Democracy Conference (EDem2008); Krems, Austria; 29-30 September 2008.
- Vice President; Steering Committee of the Computational Models of Argument (COMMA 2008) conference; 2008-2012.
- Program Committee; 12th International Conference on Artificial Intelligence and Law (ICAIL 09); Barcelona, Spain; June, 2009.
- Program Committee; Jurix 2008 Conference on Legal Knowledge Systems; Florence, Italy; 10-13 December 2008.
- Program Committee; Jurix 2008 Workshop on Online Dispute Resolution; Florence, Italy; 10 December 2008.
- Program Committee; First International Conference on eParticipation (ePart) 2009; Linz, Austria; 31 August - 4 September 2009.
- Program Committee; Third Conference on Electronic Democracy (EDem 2009); Vienna, Austria; 7-8 September 2009.
- Program Committee; Third International Conference on Computational Models of Argument (COMMA 2010); University of Brescia, Italy; 8-10 September, 2010.
- Program Committee; Fachtagung für Rechtsinformatik und Verwaltungsinformatik (FTVI & FTRI 2010); Universität Koblenz; 25-26 März, 2010.
- Program Committee; Jurix 2009 Conference on Legal Knowledge Systems; Rotterdam, The Netherlands; 16-19 December 2009.
- Scientific Committee; Legislative XML Summer School; San Domenico di Fiesole (Florence, Italy); 7-12 September 2009.
- Editorial Board; Argument and Computation; Taylor and Francis; London; 2009 to present.
- Program Committee; Fourth Conference on Electronic Democracy (EDem 2010); Danube University, Krems, Austria; 6-7 May 2010.
- Program Committee; Second International Conference on eParticipation (ePart 2010); University of Lausanne; Lausanne, Switzerland; August 29 - September 2, 2010.
- Program Committee; 4th International Conference on Online Deliberation (OD2010); University of Leeds, United Kingdom; 30 June - 2 July, 2010.
- Program Committee; IADIS International Conference e-Democracy, Equity and Social Justice; Albert Lüdwig University; Freiburg, Germany; 26 - 28 July 2010.
- Track Chair, Rules and Norms; 4th International Web Rule Symposium (RuleML 2010); Washington D.C., USA; 21-23 October 2010.
- Program Committee; 10th International Workshop on Computational Models of Natural Argument, CMNA X; Lisbon, Portugal; August, 2010.
- Program Committee; Jurix 2010 Conference on Legal Knowledge Systems; 2010.
- Section Editor for Argumentation; Artificial Intelligence and Law; Springer-Verlag; Heidelberg; as of June, 2010.
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