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OIO (PhD-student) at the University of Nijmegen, at the Computer Science Department from 1990 till 1994.
From February 1995 till March 1998, post-doc researcher involved in the OVIS-project (Openbaar Vervoer Informatie Systeem), at the department of Humanities Computing of the University of Groningen.
From March 1998 till July 2000, senior researcher at DFKI, Saarbrücken, involved in the Verbmobil-project. From November 1999 till March 2000, on leave from DFKI, consultant at AT&T Shannon Laboratory.
From July 2000 till July 2003, KNAW fellowship at the department of Humanities Computing of the University of Groningen.
From August 2003 till September 2005, lecturer at the department of Humanities Computing of the University of Groningen, and affiliated to the Pionier project Algorithms for Linguistic Processing.
From October 2005 till October 2006, senior researcher at the Max Planck Institute for Psycholinguistics. From July 2006 till September 2006, on leave from MPI, sabbatical with the Research Group on Mathematical Linguistics at the Rovira i Virgili University.
From November 2006, lecturer at the School of Computer Science of the University of St Andrews.
Member of programme committee of IWPT 2013, Nara, Japan, November 13-15, 2013.
Reviewer for CoNLL-2013, Bulgaria, August 8-9, 2013.
Reviewer for ACL2013, Bulgaria, August 4-9, 2013.
Member of standing committee of Formal Grammar 2013, Düsseldorf, Germany, August 10-11, 2013.
Reviewer for NAACL-HLT 2013, Altanta, June 10-12, 2013.
Chair of FSMNLP 2013, St Andrews, Scotland, July 15-17, 2013.
Reviewer for DLT 2012, Taipei, August 14-17, 2012.
Member of standing committee of Formal Grammar 2012, Opole, Poland, August 11-12, 2012.
Reviewer for EMNLP-CoNLL 2012, July 12–14, 2012 — Jeju, Korea.
Member of programme committee of TAG+11, Paris, Sep, 2012.
Member of programme committee of FSMNLP 2012, San Sebastián, Basque Country, July 24-25, 2012.
Reviewer for ACL 2012, Jeju, Republic of Korea, July 8-14, 2012.
Reviewer for NAACL - HLT 2012, Montréal (Québec), Canada, June 3-8, 2012.
Member of program committee of ATANLP 2012, Avignon, France, April 24, 2012.
Reviewer for EACL 2012, Avignon, France, April 23 - 27, 2012.
Reviewer for IJCNLP 2011, Chiang Mai, Thailand, November 8-13, 2011.
Member of standing committee of Formal Grammar 2011, Ljubljana, Slovenia, August 6-7, 2011.
Reviewer for EMNLP 2011, Edinburgh, Scotland, July 27–31, 2011.
Reviewer for ICALP 2011, Zürich, Switzerland, July 4-8, 2011.
Member of programme committee of IWPT 2011, Dublin, October 5-7, 2011.
Keynote speaker for FSMNLP 2011, July 12-15, 2011, Blois, France.
Reviewer for CoNLL 2011, Portland, Oregon, on June 23-24, 2011.
Reviewer for ACL-HLT 2011, Portland, Oregon, USA, June 19-24, 2011.
Member of programme committee of LATA2011, Tarragona, Spain, May 30 – June 3, 2011.
Member of standing committee of Formal Grammar 2010, Copenhagen, Denmark, August 7-8, 2010.
Reviewer for ICALP 2010, Bordeaux, France, July 5-12, 2010.
Member of program committee of ATANLP 2010, Uppsala, Sweden, July 16, 2010.
Member of program committee of CoNLL-2010, Uppsala, Sweden, July 15-16, 2010.
Member of program committee of ACL 2010, Uppsala, Sweden, July 11-16, 2010.
Reviewer for NAACL - HLT 2010, Los Angeles, June 1-June 6th, 2010.
Series of tutorials at WATA 2010, May 3 - 7, 2010, Leipzig, Germany,
Common pitfalls to avoid when writing a paper in the area of computational linguistics.