2003, WC Sydney, Australia
Prof. Perry Sprawls, USA
2006, WC, Seoul, Korea
Dr. Slavik Tabakov, UK
2009, WC, Munich, Germany
Dr. Madan Rehani, IAEA, Austria
2012, WC, Beijing, China
Dr. Ahmed Meghzifene, IAEA, Austria
2015, WC, Toronto, Canada
Prof. William Hendee, USA
2018, WC, Prague, Czech Republic
Prof. Anchali Krisanachinda, Thailand