| 2019 | Member organising and scientific committee of the Pioneer-to-Policymaker conference 27-29 November, Utrecht, concerning the transition towards animal-free innovations. https://www.transitieproefdiervrijeinnovatie.nl/english/what-tpi-does-and-supports/international-conference |
| 2019 | Member organising and scientific committee of the symposium ‘After translational strategies’. 27 November 2019, Utrecht |
| 2017 | Member of the organising committee of the FEDERA-ZonMW symposium Too valuable to waste: Experiments on humans and animals,16 June 2017 |
| 2016 – 2017 | Member organising and scientific committee ESLAV-ECLAM-LAVA conference on Reproducibility in Edinburgh, 2017 |
| 2016 – 2017 | Member program committee Labroots conference, virtual laboratory animal science conference 8,9 February 2017 |
| 2015 | Main organiser conference Laboratory Animal Science 2.0, Nijmegen, 2015 |
| 2011 – 2013 | Scientific committee FELASA symposium, Barcelona, Spain, 2013 |
| 2010 – 2012 | Main organiser first international symposium on Systematic Reviews of animal studies, Nijmegen, The Netherlands, 2012 |
| 2010 – 2011 | Scientific committee 8th World Conference on Alternatives, Montreal, Canada, 2011 |
| 2008 – 2010 | Scientific committee FELASA-ScandLAS symposium Helsinki, Finland, 2010 |
| 2005 – 2007 | Organising committee FELASA symposium Como, Italy, 2007 |
| 2002 – 2004 | Scientific committee FELASA symposium Nantes, France, 2004 |
| 2001 – 2002 | Organising committee FELASA symposium Aachen, Germany, 2002 |
| 2001 | Organising committee ScandLAS symposium Aarhus, DK |
| 1997 | Organising committee ScandLAS symposium Copenhagen, DK |
| 1996 | Programme committee World Congress on Alternatives Utrecht, The Netherlands |
| 1996 | Organising committee NVP Symposium Rotterdam |