Individuals or organizations who voluntarily contribute a minimum of US $ 200 annually to the Society receive a special mention and are being listed separately as "Benefactors" in the IGS Membership Directory.

Mr. Carroll B. Hart, Belton Industries, USA - Since 1990
Mr. Vadim Boubnovsky, OJSC “494 UNR,” Russia - Since 2003

HONORARY MEMBERS

Prof. Masami Fukuoka, Japan - Since 1989
Mr. Gert den Hoedt, The Netherlands - Since 1994
Dr. J.P. Giroud, USA - Since 2002
Dr. R. K. Rowe, Canada - Since 2006
Dr. Robert Koerner, USA - Since 2008

PAST PRESIDENTS