Passage: Since 1999 Manfred Curbach has been a member of the scientific advisory board of the magazine Beton- und Stahlbetonbau. Since 2010 he is head of the German delegation of the International Concrete Association fib and since February 2012 he is on the review board of the Deutsche Forschungsgemeinschaft (DFG) (German Research Foundation). He is a member of the executive board and the research advisory board of the Deutscher Ausschuss für Stahlbeton (DAfStb) (German Committee for Reinforced Concrete), where he was chairman of the executive board from 2004 to 2012. From 2002 to 2008 he was a member of the senate of the DFG and from 2003 to 2008 chairman of the executive board of the VDI-Gesellschaft, Bautechnik (Association of German Engineers – Division Construction Engineering). Curbach has been a member of the scientific advisory board of the Bundesanstalt für Wasserbau (BAW) (Federal Waterways Engineering and Research Institute) since 2011 and has been its chairman since 2015.

Question: What was Curbach's position between the years of 2003 and 2008?
chairman of the executive board of the VDI-Gesellschaft