Memberships
since 2005	Member of the ig-architektur - architect's organisation Austria
since 2003	Member of the American Institute of Aeronautics and Astronautics (AIAA)
	Technical Subcommittee on Aerospace Architecture
2000	Founding member of the Lunar Explorers Society
since 2000	Member of the International Lunar Explorer Working Group (ILEWG), Task Coordinator in Infrastructures,Human aspects and Living on the Moon
since 1998	Member of the Dutch architect's chamber, reg.no. 1.990701.021