Jared Isaacman, the billionaire leading the Polaris Dawn mission, and Sarah Gillis, a SpaceX engineer, exited and re-entered their spacecraft in a test of commercial space technologies. Jared Isaacman, the billionaire leading the Polaris Dawn mission, and Sarah Gillis, a SpaceX engineer, exited and re-entered their spacecraft in a test of commercial space technologies. Space Exploration Technologies Corp, Private Spaceflight, Rocket Science and Propulsion, Protective Clothing and Gear, Space and Astronomy, Isaacman, Jared (1983- ), Gillis, Sarah, Poteet, Scott, Menon, Anna NYT > Science