WC 2000, Chicago, USA
Prof. John R Cameron, USA
WC 2003, Sydney, Australia
Prof. Andree Dutreix, France
WC 2006, Seoul, Korea
Prof. John R Cunningham, Canada
WC 2009, Munich, Germany
Prof. Azam Niroomand-Rad, USA
WC 2012, Beijing, China
Prof. Charles A Mistretta, USA
WC 2015, Toronto, Canada
Prof. Colin Orton, USA
WC 2018, Prague, Czech Republic
Prof. Kwan Ng, Malaysia