I3E 2011: 11th IFIP Conference on e-Business, e-Services, e-Society, October 12-14, 2011, Kaunas, Lithuania: Program Committee

6th Mediterranean Conference on Information Systems (MCIS 2011): Track on "Mobile, Pervasive and Ubiquitous Information Systems", Cyprus, September 3 – 5, 2011:  Program Committee

Conference e-Society 2011, March 10-13, 2011, Avila, Spain: Program Committee 

I3E 2010 – 8th IFIP Conference on e-Commerce, e-Business, and e-Government, November 2-5, 2010, Buenos-Aires, Argentinia: Program Committee

Service Engineer, multidisziplinärer Allrounder oder Erfüllungsgehilfe auf Abruf? Der „Chief Social Media Officer” (CSMO'10) Workshop auf der Informatik 2010, Leipzig, September 28, 2010: Program Committee

The 9th International Conference on Mobile Business (ICMB) 2010, June 27-29, 2010, Athens, Greece: Program Committee

2. Konferenz zu Mitarbeiterportalen in der Unternehmenspraxis - MiPo'10|2: Kooperation und Organisation mit Social Media, 16.-17. Juni 2010, Aalen, Germany: Program Committee

eGov Summit, May 26-27, 2010, Sofia, Bulgaria: Programm Committee

Conference e-Society 2010, March 18-21, 2010, Porto, Portugal: Program Committee

MKWI 2010 - Multikonferenz Wirtschaftsinformatik, 23.-25. Feb. 2010, Göttingen: Program Committee Teilkonferenz 'E-commerce und E-Business'

UNESST 2009 – The 2nd International Conference on u- and e- Service, Science and Technology, December 10-12, 2009, Jeju Island, Korea: Program Committee

I3E 2009 – 8th IFIP Conference on e-Commerce, e-Business, and e-Government, September 23-25, 2009, Nancy, France: Program Committee

DIGIBIZ 2009 The International Conference on Digital Business, June 17-19, 2009, London, UK: Program Committee

WHICEB 2009 - The Seventh Wuhan International Conference on E-Business, May 30-31 June, 2009, Wuhan, China: International Program Committee

Conference e-Society 2009, February 25-28, 2009, Barcelona, Spain: Program Committee 

UNESST 2008 – The First International Conference on u- and e- Service, Science and Technology, December 13-15, 2008, Hainan Island, China: Program Committee

I3E 2008 – 8th IFIP Conference on e-Commerce, e-Business, and e-Government, September 24-26, 2008, Tokyo, Japan: Program Committee

The 21st Bled eConference: eCollaboration, Bled, Slovenia, June 15-18, 2008: Program Committee

WHICEB 2008 - The Seventh Wuhan International Conference on E-Business: Integration and Innovation through Measurement and Management, May 31- 1 June, 2008, Wuhan, China: International Program Committee

Conference e-Society 2008, April 9-12, 2008, Algarve, Portugal: Program Committee

Conference e-Society 2007, July 3-6, 2007, Lisbon, Portugal: Program Committee

WHICEB 2007 - The Sixth Wuhan International Conference on E-Business: Integration and Innovation through Measurement and Management, May 26-27, 2007, Wuhan, China: International Program Committee

Workshop ‘Design of Smart Products’, March 23, 2007, Furtwangen, Germany: Program Committee

8. Internationale Tagung Wirtschaftsinformatik, Track 'Elektronische Märkte und elektronische Verhandlungen', 28. Feb. - 2. März 2007, Karlsruhe (Program Committee)

I3E 2006 - Sixth IFIP Conference on e-Commerce, e-Business, and e-Government, October 11-13, 2006, Turku, Finland: Program Committee

WHICEB 2006 - The Fifth Wuhan International Conference on E-Business: Integration and Innovation through Measurement and Management, May 27-28, 2006, Wuhan, China: International Program Committee

e-Society 2006, July 13-16, 2006, Dublin, Ireland: Program Committee I3E 2005 - Fifth IFIP Conference on e-Commerce, e-Business, and e-Government, October 26-28, 2005, Poznan, Poland: Program Committee

ITS 16th European Regional Conference, in association with the 32th EARIE Conference, September 4-6, 2005, Porto, Portugal: Program Committee

Workshop on "Service oriented Solutions for Cooperative Organizations" (SoS4CO '05) in conjunction with the 7th International IEEE Conference on Electronic Commerce Technology (CEC) 2005, July 19-22, 2005, Muenchen, Germany: Program Committee

e-Society 2005, June 27-30, 2005, Qawra, Malta: Program Committee

The Fourth Wuhan International Conference on E-Business: Internet Era & The Global Enterprise, June 4-5, 2005, Wuhan, China: International Program Committee

2nd Annual CoMpEet (Conference on Managing panEuropena eTransformation), June 2-3, 2005, Vienna, Austria: Program Committee

I3E 2004 - Fourth IFIP Conference on e-Commerce, e-Business, and e-Government, August 22-27, 2004, Toulouse, France: Program Committee

e-Society 2004, July 16-19, 2004, Spain: Program Committee

Frühjahrstagung der Fachgruppe 5.5 e-Commerce: 'Koordination in Wertschöpfungsnetzen', Multi-Konferenz Wirtschaftsinformatik 2004 (MKWI04), 9.-11. März 2004, Essen: Program Committee

ICIS 2003, December 14-17, 2003, Seattle, USA: Program Committee: Associate Editor

ICEC2003, September 30 - October 3, 2003, Pittsburgh, PA, USA: International Programme Committee

I3E: IFIP conference on E-Commerce, E-Government, E-Business, September 22-24, 2003, S. Paulo, Brazil: Program Committee

E-Business - Economic Impact and Policy Implications, June 13-14, 2003, Berlin, Germany: Program Committee

e-Society 2003, June 3-6, 2003, Lisbon, Portugal: Program Committee

ICIS 2002, December 15-18, 2002, Barcelona, Spain: Program Committee: Associate Editor

ICEC2002, October 23 - October 25, 2002, Hong Kong: International Programme Committee

WHEB2002 The second Wuhan International Conference on Electronic Business , October 19-21, 2002, Wuhan, China: International Programme Committee

E-Commerce: Netze, Märkte, Technologien : Herbsttagung der Fachgruppe 5.5 e-Commerce, Multi-Konferenz Wirtschaftsinformatik 2002 (MKWI02), 9.-11. September 2002, Nürnberg: Program Committee

JMM - The International Journal on Media Management, Vol. 3, Issue 3 (Autum 2001) : Associate Reviewer

ICEC2001, October 31 - November 4, 2001, Vienna: International Program Committee

Verteilte Informationssysteme auf der Grundlage von Objekten, Komponenten und Agenten (vertIS 2001), October 4-5, 2001, Bamberg: Programme Committee

I3E: IFIP conference on E-Commerce, E-Government, E-Business, October 3-5, 2001, Zurich: Program Committee

'E-Commerce: Systemunterstuetzung fuer den Umgang mit Daten und Prozessen in vernetzten Anwendungsumgebungen (ECDPvA)', Workshop der GI-Fachgruppe Datenbanken (FG 2.5.1) im Rahmen der Informatik 2001, September 26-28, 2001, Vienna, Austria: Program Committee

t-world - academic workshop in connection with Telework 2001, September 13, 2001, Turku, Finland: Program Committee

COTIM 2001, July 18-20, 2001, Karlsruhe: Program Committee

Minitrack ‘Trading of Intagibles Goods’, HICSS-34, January 3-6, 2001: Program Committee

ICIS 2000, December 10-13, 2000, Brisbane, Australia: Program Committee: Associate Editor

DEXA 2000 e-Negotiations Workshop, DEXA 2000, September 4-8, 2000: Program Committee Minitrack 'Trading of Intangibles Goods', HICSS-33, January 4-7, 2000: Program Committee