Prior to joining Mitchell, Stone served as a strategic consultant supporting the Office of Secretary of Defense, and he was a Presidential appointee in the Office of Secretary of Defense's Space Policy office. Stone has served on the staffs of two United States Senators, as well as over a decade serving as a senior space policy analyst for two Secretaries of the Air Force; Chief of Staff of the Space Division at Air Force International Affairs, and Chief of Strategy for the National Guard Bureau's SpaceOperations Directorate, Pentagon. He has served as a space operations officer in the Air Force (Regular, Reserve and nowNational Guard) for over 17 years at tactical, operational, and strategic levels to include two Combatant Commands, Joint Staff,and Air Staff strategy and campaign planner positions.