The Right Stuff. American Katherine G. Johnson, is a major reason why US astronauts successfully travelled to the moon. The 'Human Calculator' for NASA-- a mathematician, physicist and scientist, has a NASA facility named after her. She was interviewed for the September 2016 Vanity Fair issue. "Johnson’s specialty was calculating trajectories for space shots which determined the timing for launches, including the Mercury mission and Apollo 11, the mission to the moon."