Her greatest gift, though, may have been reading Musk’s moods. At both SpaceX and Tesla, Brown placed her desk a few feet in front of Musk’s, so that people had to pass her before having a meeting with him. If someone needed to request permission to buy a big-ticket item, they would stop for a moment in front of Brown and wait for a nod to go see Musk or the shake-off to go away because Musk was having a bad day.

