The first all-civilian spacewalk happened Thursday ... Isaacman and engineer Sarah Gillis became the first humans on a private space flight to walk in space as part of the Polaris Dawn space ...

The 29-year-old physician assistant at St. Jude Children's Research Hospital in Memphis, Tennessee, was chosen to join the first all-civilian mission into outer space ... how to walk over the ...

As the leader of the first flight of an all-private crew of astronauts, and the first civilian to walk in space, Isaacman is making a habit of making history. From his relationship to Musk to how ...