Journal Editorships:

• VLDB Journal, 2003-2009
• Parallel Computing, 2001-2007
• Datenbank-Spektrum (-2011)

Conferences / workshops: Major roles

• ICDE 2021, April 2021, Chania (Greece), PC Vice-Chair
• ACM SIGMOD conf., Houston, June 2018, PC Group leader
• EDBT/ICDT conf., Vienna, March 2018, tutorial chair
• VLDB conference, Ph.D. Workshop, Munich, Aug. 2017, PC Co-Chair
• Workshop Big Data in Business (BIDIB), Leipzig, Nov. 2015 and June 2017, Chair
• Int. ScaDS summer school on Big Data, Leipzig, July 2016, Chair
• PopInfo 2015, 1st Int. KDD workshop on “Population Informatics for Big Data ”, Sydney, Aug. 2015, CoChair
• DILS 2014, 10th Int. Conf. on “Data Integration in the Life Sciences”, Lisbon, July 2014, Co- PC Chair
• Data Integration Day, Workshop at SABRE conference, Leipzig, Sep. 2012, Chair
• ICDE 2012, 28th Int. Conf. on Data Engineering, Washington DC. Vice PC Chair
• 2nd Web Data Integration Workshop, Leipzig, Dec. 2011, Chair
• VLDB-Workshop Quality in Databases (QDB 2011), Seattle, Aug. 2011. Co-Chair
• Web Data Integration Workshop, Leipzig, Oct. 2010, Chair
• GI-Workshop Informationsintegration in Service-Architekturen, Leipzig, Sep. 2010. Co-Chair
• ICDE 2008, 24th Int. Conf. on Data Engineering, Cancun, Mexico. Vice PC Chair
• BTW-Workshop Model Management und Metadaten, Aachen, March 2007. Co-Chair
• BMBF-Workshop Ontologien im Grid, Leipzig, 2006. Co-Chair
• DILS 2004, First Int. Workshop on “Data Integration in the Life Sciences”, Leipzig, March 2004, General Chair and PC Chair
• GI-Workshop Dynamische Informationsfusion, Ulm, Sep. 2004. Co-Chair
• BTW 2003, 10th Conf. on Databases for Business, Technology and the Web, Leipzig, 2003. General Chair
• XSym03, 1st Int. XML Database Symposium, Berlin, 2003. Co-Chair
• 2nd GI-Workshop Web Databases, Erfurt, 2002. Co-Chair
• GI-Workshop Web Databases, Vienna, 2001, Co-Chair
• 2. LIV-Jahrestagung, Leipzig, 1998, Chair
• 1. LIV-Jahrestagung, Leipzig, 1997, Chair
• Europar 1996, Lyon, France, Vice PC Chair

Program committee member: Conferences

• SIGMOD: 1997, 2002, 2006, 2009, 2012, 2018 (group leader), 2020
• VLDB: 1996, 2003, 2004, 2005, 2007, 2008, 2010, 2015
• ICDE: 2000, 2005, 2008 (Vice PC Chair), 2012 (Vice PC Chair), 2015, 2021 (Vice PC Chair)
• EDBT: 1998, 2006, 2011, 2013
• BTW: 1997, 1999, 2001, 2003 (General Chair), 2005, 2007, 2009, 2011, 2013, 2015, 2017, 2019, 2021
• DILS: 2004 (Chair), 2005, 2006, 2008, 2009, 2010, 2012, 2013, 2014 (PC chair), 2017, 2018
• ISC Conf. on Cloud and Big Data, Frankfurt, Sep. 2015
• IEEE Int. Conf. on Big Data, 2013
• Int. Conf. on Information Quality (ICIQ): 2009
• ESWC (Extended Semantic Web Conf.): 2011
• ISWC (Int. Semantic Web) Conf.): 2003
• Data Warehousing: 2002, 2004
• NOD (Net.ObjectDays): 2002, 2003
• MMB: 1997, 1999
• GMDS: 2006
• XSym: 2003 (Co-Chair)
• PARCO (Parallel Computing): 2001
• ADBIS: 1998
• EUROPAR: 1996 (Vice PC Chair for Parallel and Distributed Databases)
• PDIS: 1996

Program committee member: Workshops

• VLDB 2023 workshop on Quality in Databases (QDB), Vancouver, Aug. 2023
• ADBIS 2018 workshop on New Frontiers on Metadata Mangament and Usage (M2U), Budapest, Sep. 2018
• 2nd ICDM Workshop on Data Integration and Applications (DINA), Nov. 2015
• BTW Workshop on Big Data in Science, Hamburg, March 2015
• ICDM Workshop on Data Integration and Applications (DINA), Dec. 2014
• VLDB-Workshop Quality in Databases (QDB): 2011 (Co-Chair), 2012, 2013, 2016
• ICSW-Workshop on Ontology Matching(OM): 2010, 2012
• Int. WebDB Workshops (co-located with Sigmod): 2005, 2010, 2013
• CSWDB-08 Workshop (Corporate Semantic Web and Databases), Berlin, Sep. 2008
• VLDB-Workshop Data Management in Grids (DMG), Vienna, Sep. 2007
• BTW-Workshop Model Management und Metadaten, Aachen, March 2007 (Co-Chair)
• ICDE-Workshop Web Information Retrieval and Integration (WIRI), 2006
• BTW-Workshop IR meets WebDB, Karlsruhe, March 2005
• GI-Workshop Dynamische Informationsfusion, Ulm, Sep. 2004 (Co-Chair)
• ICSW-Workshop Semantic Integration, , Sanibel Island, Oct. 2003
• GI-Workshops “Web Databases”: Vienna 2001 (Co-Chair), Erfurt 2002 (Co-Chair), Berlin 2003
• EDBT-Workshop “XML-Based Data Management”, Prague, March 2002
• EWGLP00 (European Workshop on Computer-based Support for Clinical Guidelines and Protocols), Leipzig, Nov. 2000
• GI-Workshop "Multimediale digitale Bibliotheken", Aachen, Sep. 1997