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| From | To | Name | Country |
|---|---|---|---|
| 2012 | 2015 | João Manuel Valente Nabais | Portugal |
| 2009 | 2012 | Chris Delicata | Malta |
| 2008 | 2009 | Chris Delicata (Acting) | Malta |
| 2007 | 2008 | Eberhard Standl | Germany |
| 2006 | 2007 | Tony O'Sullivan | Ireland |
| 2003 | 2006 | Dr Wim Wientjens | The Netherlands |
| 1997 | 2003 | Prof Massimo Massi-Benedetti | Italy |