John Callen has been in the CAD/CAM field for over 30 years. Most recently, he was the product manager in Autodesk's Manufacturing Engineering group defining a next generation CAM product. Prior, he headed marketing for Gibbs and Associates, creators of GibbsCAM. Before that, he headed  product management for CAMAX, and was the SmartCAM application development manager for Point Control, another Autodesk CAM partner. John had previously worked at Autodesk as the Product Marketing Manager for Interoperability. He has been actively involved in a number of manufacturing initiatives, such Smart Machine Platform Initiative (SMPI), STEP-NC, Open Modular Architecture Controller (OMAC), and MTConnect where his experience in CAD and CAM has been invaluable.

John has written numerous articles and presented at many conferences. He recently wrote a 6 part series for Desktop Engineering on CAM 101, explaining to a CAD audience how/why CAM is different. He was also author of guidelines for buying a CAM system - http://www.deskeng.com/articles/aaacsd.htm