Organized conferences/ workshops


  • Chair and co-organizer of the 11th Global WordNet Conference (GWC2021), online, Pretoria, South Africa, January 18-22, 2021. 


  • Chair and organizer of the CLTL-Human Language Technology bedrijvendag: Meet and Greet 2020 in Gathertown, VU Universiteit Amsterdam, December 3, 2020.
  • Co-organizer of the Shared Task on the Reproduction of Research Results in Science and Technology of Language (REPROLANG2020) @ LREC2020, May 13-15, 2020, Marseille, France.
  • Co-organizer of the Multimodal Wordnets Workshop 2020 @ LREC2020, May 13-15, 2020, Marseille, France.


  • Chair and organizer of the CLTL-Human Language Technology bedrijvendag: Meet and Greet 2019, VU Universiteit Amsterdam, December 13, 2019.
  • Chair and co-organizer of the 10th Global WordNet Conference (GWC2019), Wroclaw, Poland, July 23-27, 2019.


  • Co-organizer of the Events and Stories in the News 2018 workshop at the International Conference on Computational Linguistics (COLING 2018), Santa Fe, New Mexico, USA,  August 20-25, 2018.
  • Co-organizer of the workshop “Storyline Coding and Annotation” within the theme Researching Narrative Identities with Small Stories at the Conference Narrative Matters 2018,  July 2, 2018, Enschede, the Netherlands.
  • Chair and co-organizer of the KNAW Domeinmiddag Geesteswetenschappen: Nep of niet nep: “De veranderlijke halfwaardetijd van kennis en waarheid, en de poging daar grip op te krijgen”, Amsterdam, June 25, 2018.
  • Co-organizer of the  workshop SemEval-2018 Task: Counting Events and Participants in the Long Tail at SemEval-2018, co-located with the 16th Annual Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies (NAACL-HLT 2018). New Orleans, LA, USA, June 5-6 2018.
  • Chair and co-organizer of the 9th Global WordNet Conference (GWC2018), Singapore, January 8-12, 2018.


  • Chair and co-organizer of the CLTL-Human Language Technology bedrijvendag: meet and greet, VU Universiteit Amsterdam, the Netherlands, December 7, 2017.
  • Co-organizer of the  Open Knowledge Base and Question Answering Workshop (OKBQA2017) co-located with the 40th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR2017), Tokio, Japan, August 11, 2017.
  • Co-organizer of the workshop Events and Stories in the News co-located with the Annual Meeting of the Association for Computational Linguistics (ACL2017), Vancouver, Canada, August 4, 2017.
  • Co-organizer of the workshop “Challenges for Wordnets” co-located with the 1st conference on Language, Data and Knowledge (LDK2017), Galway, Ireland, June 18, 2017.
  • Organizer of the NIAS-Lorentz workshop “Language, Knowledge and People in Perspective“, Leiden, the Netherlands, April 18-21, 2017.
  • Invited member of the jury (as a member of the KHMW) of the Keetje Hodshon Prijs 2017 of the Koninklijke Hollandsche Maatschappij der Wetenschappen (KHMW).


  • Co-organizer of the workshop Open Knowledge Base and Question Answering Workshop (OKBQA 2016) at the 26th International Conference on Computational Linguistics (COLING2016), December 11-16, 2016, Osaka, Japan.
  • Co-organizer of the 2nd Workshop on Computing News Storylines (CNewsStory-2016), co-located with EMNLP 2016, Austin, Texas, U.S.A. November 2-6, 2016.
  • Co-organizer of Unshared task on “Perspective Based Local Agreement and Disagreement in Online Debate” at 3rd Workshop on Argument Mining in conjunction with the Annual meeting of the Association for Computational Linguistics (ACL2016), Berlin, August 12, 2016.
  • Section editor of the theme Language and information in the world with Antal van den Bosch at the Summerschool 2016 by Language in Interaction, July 2016.
  • Co-organizer of the 2nd Spinoza-workshop “Looking at the Long Tail“, Amsterdam, June 24, 2016.
  • Co-organizer of the 7th Workshop on Computational Approaches to Subjectivity, Sentiment & Social Media Analysis (WASSA-2016), co-located with the NAACL-HLT 2016 Conference, San Diego, California, June 12-17, 2016
  • Chair and co-Organizer of the 8th Global WordNet Conference (GWC2016), Bucharest, Romania, January 27-30, 2016.
  • Co-organizer of the NewsReader Hackathon “Car Wars Revisited”, January 8, 2015.





  • Co-organizer of the DutchSemCor Workshop, October 25, 2012, VU University Amsterdam, the Netherlands.
  • Chair and Co-Organizer of the 6th Global WordNet Conference (GWC2012), January 9-13, 2012, Matsue, Japan








  • Organizer of the 2nd Workshop on the MEANING Project, Trento, Italy, February 3-4, 2005.




  • Organizer and panelist of the ACL Panel Global Wordnet, Standardizing and Linking wordnets with particular attention to Word Sense Inventory, Representation, and Distinction, EACL/ACL Panel, 6 July 2001.
  • Panelist on ACL Panel Senseval domain specific sense disambiguation, ACL 2001, Toulouse, EACL/ACL Panel, 6 July 2001.


  • Member of the organizing committee and attendant of the Ontology Standards workshop at Heidelberg, on behalf of the Ansi-committee on Ontology Standards. Heidelberg, Germany.



  • Member of the organizing committee of the 6th Euralex International Conference on Lexicography in Amsterdam, August 1994.