| Name | Duration |
| Grigoris Antoniou | autumn 2003 |
| Edgard Costa Oliveira | autumn 2003–summer 2004 |
| Maria Taboada Iglesias | February 2005 |
| Stefano Zanobini | half a year starting from October 1, 2004 |
| Jeff Pan | July 2005 |
| M. Yatskevich | July 2005 |
| Peter Dolog | September - October 2005 |
| Raul Garcia Castro | February - April 2007 |
| Dongmo Zhang | August -September 2007 |
| Wei Hu | November 2007 - April 2008 |
| CA¡ssia Trojahn dos Santos | February - April 2008 |
| Yi Zeng | May - June 2009 |
| VA¡clav BelA¡k | December 2009 |
| Arturo Gonzalez Ferrer | April - June 2010 |
| Víctor Gutiérrez | April 2010 |
| Yan Wang | May - June 2010 |
| Paea Lependu | October 2010 |
| Peter Mika | October 2010 |
| Jun Fang | December 2010 - December 2011 |
