• Advisory Board Member, School of Computer and Communication Sciences, Ecole Polytechnique Fédérale de Lausanne, Switzerland (2001 – 2013)
  • Advisor, Jisto, Cambridge, MA, USA (2013-2014)
  • STI Fellow, Semantic Technology Institutes International Vienna, Austria (2009 – 2012)
  • Web Science Champion for the Web Science Trust (2010-2012)
  • Member, National Research Council Committee on Future Information Architectures, Processes, and Strategies for the Centers for Medicare and Medicaid Services commissioned by The Centers for Medicare and Medicaid Services (2010 – 2011)
  • Adjunct Research Fellow, Digital Ecosystems and Business Intelligence Institute (DEBII) at Curtin University of Technology, Perth, Australia (January 2009-December 2011)
  • Member of the United States of America National Academies Committee on Technical and Privacy Dimensions of Information for Terrorism Prevention and other National Goals, co-chaired by Dr. Charles Vest, president of the National Academy of Engineering and Dr. William Perry, former US Secretary of Defense, and commissioned by the Department of Homeland Security and the National Science Foundation (April 2006-January 2008)
  • Associate Editor, International Journal of Intelligent and Cooperative Information Systems, World Scientific (1991-2010)
  • Advisory Board Chair, Semantic Technology Institutes International, Vienna, Austria (2007 – 2009)
  • Trustee, VLDB (Very Large Databases) Endowment (1992 – 2004)
  • Member, Client Advisory Board, Forrester Research, Inc. (2006-2008)
  • Reviewer, European Union’s Information Society Technologies Framework Programmes
  • Founding Board Member, International Foundation for Cooperative Information Systems (IFCIS)
  • Expert/Coordinator/Advisor in telecommunication and computing for the International Telecommunication Union (1996-2003)
  • Program Chair, VLDB 2000 Cairo, Egypt
  • Advisor, NASA Planning Board (2001-2002)
  • Advisor, NSF / USGS / NASA Research Directions in Biodiversity and Ecosystem Informatics (1999-2001)
  • Participant, US National Research Council / National Academy of Sciences activities on Computing and Humanities.
  • Associate Editor, International Journal of Cooperative Information Systems (IJCIS) (1991-2011)
  • Member, International Research Advisory Board of the Cooperative Research Centre for Distributed Systems Technology, Brisbane, Australia (1993-1998)
  • Chair, SAP Telecommunications Special Interest Group (T-SIG) (1998-2000); TSIG Advisory Board Member-at-Large (2000-2003)
  • Contributor, Presidential Information Technology Advisory Committee (PITAC) 1998-1999
  • Member, Advisory Committee ACM SIGMOD (1989-1997)
  • Member, Telecommunications Information Networking Architecture (TINA) Scientific Committee (1991-1995)
  • Member, Steering Committee, Cooperative Information Systems (CoopIS) (1993-1995)
  • Series Coeditor, Topics in Information Systems, Springer-Verlag (1982-1990)
  • Editorial Advisory Board, Information Systems Journal, Pergamon Press (1982-2012)
  • Member Advisory Committee, IRIS Division of the National Science Foundation (1988-1991)
  • Chair, ANSI/X3/ SPARC Database Systems Study Group (1979 – 1982)
  • Cofounder, Public Service Committee and Computer Ombudsman of the Canadian Information Processing Society (1975)
  • Reviewer, IEEE Data and Knowledge Engineering, IEEE Transactions on Software Engineering, ACM Transactions on Database Systems, Information Systems Journal, CACM, and others
  • Participated in numerous conferences as keynote speaker, program chair, panel chair, program committee member, workshop organizer, and invited speaker
  • Consulted to research organizations of the governments of USA, Canada, France, Italy, Germany, Colombia, Brasil, Denmark, Australia, Russia, Belarus, Ukraine, and the EEC