 He later co-founded two software companies – Cambridge Interactive Systems (CIS) which was known for its Medusa 2D/3D CAD system, and Smallworld with its eponymous Smallworld GIS (Geographical Information System).Martin Newell later went to the University of Utah where he did pioneering 3D solid modelling work; he was also one of the progenitors of PostScript.Subsequently the UK government, via the British Technology Group (BTG) established a separate company, Compeda Ltd, to exploit software developed and owned by the government and they took over the marketing and user support of PDMS, while the software continued to be developed by the CADCentre, with funding from Compeda.