George Lordos is not your typical graduate student. A degree in economics from Oxford University, an MBA from the MIT Sloan School of Management, and a 20-year professional career were not the end of his learning journey. His longtime passion for space, particularly the prospect of making a sustainable society on Mars a reality, drew him back to school yet again, this time to study aeronautics and astronautics at MIT. Lordos remembers vividly the impetus for this change in his professional trajectory. In 2014, SpaceX started demonstrating reusable rockets. “I…