2023 - 2025
Castulus Kolo
2021 - 2023
John Oliver
2016 - 2021
Ulrike Rohn
2012 - 2016
Gregory Ferrel Lowe
2010 - 2012
Charles Brown
2008 - 2010
Lucy Küng
2006 - 2008
Heinz-Werner Nienstedt
2003 - 2005
Alfonso Sánchez-Tabernero