General Motors, one of the world?s largest automakers, traces its roots back to 1908. With its global headquarters in Detroit, GM employs 202,000 people in every major region of the world and does business in more than 120 countries. GM and its strategic partners produce cars and trucks in 30 countries. GM?s OnStar subsidiary is the industry leader in vehicle safety, security and information services. GM Operations in Oakland County the global headquarters for GM Powertrain, Orion Assembly Center, Milford Proving Ground, a Metal Fabricating Plant and two Customer Care and Aftersales warehouses.