- 1974 to 1977 – Henk Arntz – The Netherlands
- 1977 to 1984 – François Jaeger – France
- 1984 to 1994 – François Settembrino – Belgium
- 1994 to 1999 – Hugh Loader – UK
- 1999 to 2001 – Maurizio Castelli – Italy
- 2001 to 2005 – Thierry van Santen – France
- 2005 to 2009 – Marie-Gemma Dequae – Belgium
- 2009 to 2011 – Peter den Dekker – The Netherlands
- 2011 – Onwards – Jorge Luzzi – Italy
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