From December 2006 to present: Developing three-dimensional geological subsurface models of the shallow subsurface of the Netherlands - in particular the GeoTOP voxel model which provides a sound basis for subsurface related questions on, amongst others, groundwater extraction and management, land subsidence studies, aggregate resources and infrastructural issues. From 1990 to 1995: PhD Research involving seismic modelling of large outcrops. I produced seismic models of outcrops to study resolution problems in exploration seismic data, and to offer alternatives for traditional seismic interpretation techniques