Nathan Siebert 
Nathan Siebert is currently the Engineering Group Manager for Fluids and Lubricants at General Motors. His major responsibility is oversite of the development and implementation of lubricants and fluids within GM including the dexos engine oil and dexron transmission fluid specifications. He is GM’s voting member for ILSAC and a member of the ASTM Test Monitoring Center’s Executive Committee. Nathan has worked for GM for 21 years in multiple roles ranging from manufacturing engineering and procurement to his current position as Engineering Group Manager.  He holds a Masters in Manufacturing Operations from Kettering University and a Bachelors in Mechanical Engineering from Missouri School of Science and Technology.