Coding the geometry engine of Parasolid Version 1.
Helping to develop the geometry inside HP's SolidDesigner product (which in the intervening years morphed into CoCreate's SolidDesigner, then into Pro/E's Creo Elements/Direct). After that, working on a sketcher for Sanei Giken, Japan (based on D-Cubed's DCM constraint manager). And finally, developing geometric algorithms for D-Cubed's Hidden Line Manager component.
At various times, leading the development teams for eDrawings, SolidWorks DXF/DWG translation, Systems, Graphics, QA Automation, Integration, and Interoperability.
up to present day