Pavlos Dimitratos (2017-2021)
Heinz-Josef Tüselmann (2011-2017)
Frank McDonald (2007-2011)
Jeremy Clegg (2001-2007)
James Taggart (2000-2001)
Fred Burton (1996-2000)
Stephen Young (1991-1996)
Peter J, Buckley (1985-1991)
Michael Z. Brooke (1973-1985)