General Chair,
International Semantic Web Conference (ISWC), Online, October 24-28, 2021
Track Co-Chair,
Web Content Analysis, Semantics, and Knowledge,
27th edition of The Web Conference (WWW 2018), Lyon, France, April 23-27, 2018
Track Co-Chair,
Social Web and Web Science,
14th Extended Semantic Web Conference (ESWC 2017), Portoroz, Slovenia, May 28-June 1st, 2017
Track Co-Chair,
Personalization in the Social Web & Crowdsourcing Era Track,
24th Conference on User Modeling, Adaptation and Personalization (UMAP 2016), Halifax, Canada, July 13-17, 2016
Programme Co-Chair,
Web Science Track,
International World Wide Web Conference (WWW 2014), Seoul, South Korea, April 7-11, 2014
Programme Co-Chair,
ACM Web Science Conference (WebSci), Paris, France, May 2-4, 2013
Programme Co-Chair,
International Semantic Web Conference (ISWC), Sydney, Australia, October 21-25, 2013
Co-Chair,
AAAI 2012 Spring Symposium on Intelligent Web Services Meet Social Computing, Stanford, USA, March 2012
Co-Chair,
22nd ACM Conference on Hypertext and Hypermedia (HyperText) Semantic Data track, WI, USA, June 2012
Co-Chair,
International Semantic Web Conference (ISWC) In-Use Paper Track, Koblenz, Germany, 2011
Chair,
4th Future Internet Symposium (FIS) Semantic Technologies track, Vienna, Austria, November 2011
Co-Chair,
ESWC Sensor Web Track, Heraklion, Crete, 2011
Semantic Web Technologies co-chair,
Extended Semantic Web Conference (ESWC), Heraklion, Crete, 2010
Poster/Demo co-chair,
International Semantic Web Conference (ISWC), Washington DC, 2009
Semantic Web Technologies co-chair,
European Semantic Web Conference (ESWC), Heraklion, Crete, 2009
Workshop co-chair,
Workshop on Collaborative Construction, Management and Linking of Structured Knowledge (CK 2009),
ISWC 2009, Washington DC, 2009