2008
- Keynote speaker on Kyoto at DART 2008: 2nd Workshop on Distributed Agent-based Retrieval Tools, 10 September 2008, Cagliari, Italy
2007
- Invited Speaker on Global Wordnet Grid on the 6th International PLAIN Language Conference, Amsterdam, Netherlands, October 11-14, 2007,
- Invited Speaker on the Stevin Programmadag, Nederlandse TaalUnie, Hoeven, September 21,
- Invited speaker on "Cornetto: Een Combinatorische Semantische Database voor het Nederlands" for the Capita Selecta of the Instituut voor Nederlandse Lexicologie (INL), Leiden, May 22, 2007.
- Invited speaker at the "African Languages WordNet Workshop/Training" of the Department African Languages of the University of South Africa, Unisa), Pretoria, South Africa, March 21-23, 2007.
- Presentation on "The design of the Cornetto Database", In: Proceedings of CLIN 17, Centre for Computational Linguistics, Faculty of Arts of the University of Leuven, January 12, 2007
2006
- Presentation on "Er kan meer dan men doet met de Cornetto Database" at the TST-dag, Rotterdam, November 30, 2006.
2005
- Invited speaker: Demo on the search engine of Irion at the CLIN dag : CLIN 2005: The 16th Meeting of Computational Linguistics in the Netherlands, Amsterdam, December 16, 2005.
- Invited speaker: "Building Wordnets", International Seminar on Wordnets in general and DanNet: a Danish WordNet, based on the Princeton WordNet and EuroWordNet, University of Kopenhagen, Denmark, 13 October 2005.
- Invited speaker: Kickoff-meeting of a new project "Constructing Arabic Wordnet in Parallel with an Ontology", University of Princeton, USA, August 30-September 5, 2005.
- Videopresentation on "Het RBN als lexicon in een classificatiesysteem" for the TST-dag, Antwerpen, July 4, 2005.
- Invited speaker: "A centralized approach to language resources",, Multilinguism Meeting EU, Luxembourg, June 6, 2005.
- Invited speaker: "Crossing the chasm between statistic processing and language understanding", University of Amsterdam, Amsterdam, May 19, 2005.
- Invited speaker: Wat wil de industrie van de kennisinfrastructuur?, Tweede brokerage event - Domein Taaltechnologie: "Taal- en spraaktechnologie en de ICT-markt, Nederlandse Taalunie, Antwerpen, 2 maart 2005.
- Invited speaker: Meaning-2 for the 5th EU Call IST 2005-2006 Work Programme 2.5.7 Multimodal Interfaces, Luxembourg, February 28, 2005.
2004
- Invited speaker: Cornetto: a Combinatoric and relational network for language technology", International Colloquium on "Word structure and lexical systems: models and applications",
University of Pavia, Italy, 16-17 December 2004.
- Invited speaker: Wordnets for Information Retrieval: a hole in one, organizer: Omnipaper, Leuven. Belgium, 2 december 2004.
- Invited speaker: Interactieve Workshop Taal & Spraak, Senter, The Hague, The Netherlands, 15 september 2004.
- Invited speaker: Search Engine Meeting, The Hague, The Netherlands, 19-20 April 2004.
2003
- Invited speaker Wordnet, EuroWordNet and Global Wordnet at Dublin University College Ireland, March 22, 2003.
- Inivited speaker: Senter, Zwolle
- Tutorial Wordnet, EuroWordNet and Global Wordnet, International Conference RANLP-2003 (Recent Advances in Natural Language Processing), Borovets, Bulgaria, 10-12 September 2003.
2002
- Invited Speaker Content for content. XVIII Conference of SEPLN in Valladolid, Spain. 11-13 September 2002
2001
- Invited Speaker "Tuning Document-Based Hierarchies with Generative Principles at the ISSCO workshop on the generative lexicon, Geneva, April 2001 (ISSCO)
- Invited Speaker WordNet, EuroWordNet and Global Wordnet at the `Computing with Logic, Language, and Information' Seminar. Institute for Logic, Language and Computation University of Amsterdam (ILLC)
- Invited Speaker Multilingual Language Technology as a Commercial Business , SPINN seminar, Kopenhagen, Denmark, 26 -27 October 2001.
2000
< 2000
- Course on the use of Wordnets in NLP at the Faculty of Humanities, University of Amsterdam, 1999.
- Lecture on Functional Lexicology at the Amsterdam Summer School, University of Amsterdam, 1992.