| Student Assistant, ESF Linguistic Stress database. | 1991 - 1992. |
| Research Assistant, General Linguistics Dept. Leiden University. | 1993. |
| NWO PhD student (OIO) Research School "Holland Institute of Generative Linguistics" | 1993 - 1997. |
| IT helpdesk employee & PC support, Leiden University (part-time) | 1997 - 1998. |
| Computer Assisted Learning tools developer, phonetics lab Leiden University (part-time) | 1998 - 1999. |
| Postdoctoral Fellow ULCL Leiden University. Prosody of Indonesian Languages project (part-time) | 1997 - 2001. |
| Postdoctoral Fellow - Utrecht Institute of Linguistics UiL-OTS, Utrecht University. Syntactic Internet Encyclopaedia project (part-time) | 1999 - 2002.
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| Webmaster for temporary project. Linguistics Dept. Leiden University (part-time) | 2002 - 2003.
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| PhD Coordinator "Universiteit Leiden Centre for Linguistics" (part-time) | 2002 - 2003.
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| Database specialist and webdesigner "Utrecht Institute of Linguistics UiL-OTS"
Typological Database project (part-time) | 2002 - 2003.
|
| PhD Coordinator "Utrecht Institute of Linguistics OTS" (part-time) | 2003 - 2004.
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| ICT & O Coordinator & Editor-in-chief Webcommunications, Faculty of Arts, Leiden University (part-time) | 2003 -
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| Postdoctoral fellow, LUCL, Typological Database project, Faculty of Arts, Leiden
University (part-time) |
2003 - 2007
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| Chairman of student society "Hwaet", English Dept. , Leiden University | 1990 - 1992. |
| Student member of Board, Dept. of General Linguistics, Leiden University | 1991 - 1993. |
| Treasurer of "Student Organisation of Linguistics in Europe" (SOLE) | 1994 - 1998. |
| Assistant Editor of "The Linguistic Review" | 1995 - 2000. |
| Co-Editor of "The Linguistic Review" | 2001 - 2004. |
| Editorial board of "The Linguistic Review" | 2005 - |
| Goodies (computer tools for/by linguists) Editor of "Glot International" | 2001 - 2003. |