Peter Sandbichler July - August 2015
Ursula Mayer January 2015
Markus Hanakam & Roswitha Schuller June 2014
Karunasiri Wijesinghe December 2013 - January 2014
Theegulla Venkanna August - September 2013
Christian Eisenberger May - June 2013
Hans Schabus December 2011 - February 2012
Clarina Bezzola October - December 2010
Suhasini Kejriwal August - September 2010
Marcus Geiger February - March 2010
Thomas Helbig September - October 2009
Navin Thomas April - June 2009
Sudarshan Shetty January 2009