• General Chair
  18th IEEE International Enterprise Distributed Object Computing Conference (EDOC'14)
  Ulm, Gernany; 1-5 September 2014
• PC Chair (with Hamid R. Motahari Nezhad)
  17th IEEE International Enterprise Distributed Object Computing Conference (EDOC'13)
  Vancouver, Canada; 9-13 September 2013
• Doctoral Consortium Chair (with Karsten Wolf and Boualem Benatallah)
  10th Int'l Conference on Business Process Management (BPM'12)
  Talinn, Estland; 2 September 2012 
• PC Chair (with Akhil Kumar and Qing Li)
  19th Int'l Conference on Cooperative Information Systems (CoopIS'11)
  Crete, Greece, October 19-21, 2011
• General Chair (with Peter Dadam)
  7th Int'l Conference on Business Process Management (BPM'09)
  Ulm, Germany; September 7-10, 2009
• PC Chair (with Marlon Dumas)
  6th Int’l Conference on Business Process Management (BPM'08)
  Milan, Italy, September 2-4, 2008 

• PC Chair (with Mor Peleg and Richard Lenz)
  7th Int'l Workshop on Process-Oriented Information Systems in Healthcare (ProHealth'14)
  Haifa, Israel; 8 September 2014
• PC Chair (with Stefanie Rinderle-Ma, Johannes Reich, Walid Fdhila and David Knuplesch)
  1st Int’l Workshop on Compliance, Evolution and Security in Cross-Organizational Processes (CeSCoP 2014)
  Ulm, Germany; 1-2 September 2014
• PC Chair (with Félix García and Victoria Torres)
  2nd Int'l Workshop on Variability Support in Information Systems (VarIS'14)
  Thessaliniki, Greece; 16 June 2014
• PC Chair (with Reinhard Jung)
  5th International Workshop on Enterprise Modelling and Information Systems Architectures (EMISA'13)
  St. Gallen, Switzerland; 5-6 September 2013
• PC Chair (with Félix García and Victoria Torres)
  1st Int'l Workshop on Variability Support in Information Systems (VarIS'13)
  Valencia, Spain; 17-18 June 2013
• PC Chair (with Mor Peleg, Silvia Miksch and ohers)
  5th Int'l Workshop on Process-oriented Information Systems in Healthcare (ProHealth'12)
  Tallinn, Estland, 3 September, 2012
• PC Chair (with Mor Peleg and Richard Lenz)
  4th Int'l Workshop on Process-oriented Information Systems in Healthcare (ProHealth'11)
  (held in conjunction with BPM'11 conference),
  Clermont-Ferrand, France, August 29, 2011
• PC Chair (with Mor Peleg and Richard Lenz)
  2nd Int'l Workshop on Process-oriented Information Systems in Healthcare (ProHealth'07)
  (held in conjunction with BPM'08 conference),
  Milan, Italy, September 1, 2008
• PC Chair (with Klaus Turowski)
  2nd Int’l Workshop on Enterprise Modelling and Information Systems Architectures - Concepts and Applications (EMISA'07)
  St. Goar, Germany, October 8-9, 2007
• PC Chair (with Mor Peleg and Richard Lenz)
  1st Int'l Workshop on Process-oriented Information Systems in Healthcare (ProHealth'07)
  (held in conjunction with BPM'07 conference),
  Brisbane, Australia; September 24, 2008
• PC Chair (with Barbara Weber and Rik Eshuis)
  2nd IEEE Int'l Workshop on Agile Cooperative Process-Aware Information Systems (ProGility'07)
  (held in conjunction with the WETICE'07 workshops)
  Paris, France; June 18-20, 2007
• PC Chair (with Shazia Sadiq and Karsten Schulz)
  2nd Int'l Workshop on Technoloies for Collaborative Business Process Management (TCoB'07)
  (held in conjunction with the ICEIS'07 conference)
  Funchal, Portugal, June 2007
• PC Chair (with Barbara Weber and Jan Mendling)
  1st IEEE Workshop on Flexibility in Process-aware Information Systems (ProFlex'06)
  (held in conunction with WETICE'06 workshops)
  Manchester, UK; June 2006
• PC Chair (with Shazia Sadiq and Karsten Schulz)
  1st Int'l Workshop on Technologies for Collaborative Business Process Management (TCoB'06)
  (held in conjunction with ICEIS'06 conference)
  Paphos, Cyprus; May 2006
• PC Chair (with W. Hasselbring and R. Lenz)
  2nd GI/GMDS Workshop on Enterprise Application Integration (EAI'05)
  Marburg, Germany; June 30 - July 1, 2005
• PC Chair (with W. Hasselbring)
  1st GI Workshop on Enterprise Application Integration (EAI'04)
  Oldenburg, Germany; February 2004
• PC Chair (with Mathias Weske)
  GI Workshop Geschäftsprozessorientierte Architekturen (GPA'04)
  Ulm, Germany, September 2004
• PC Chair (with Peter Dadam)
  GI Workshop on Enterprise-wide and Cross-Enterprise Workflow Management
  (held in conjunction with Informatik'99)
  Paderborn, Germany, October 1999

Please have a look at the dedicated web sites for conferences' program committee memberships and workshops' program committee memberships.