These early days marked the arrival of Mary Beth Brown as well. Brown—or MB, as everyone called her—became Musk’s loyal assistant, establishing a real-life version of the relationship between Iron Man’s Tony Stark and Pepper Potts. If Musk worked a twenty-hour day, so did Brown. Over the years, she brought Musk meals, set up his business appointments, arranged time with his children, picked out his clothes, dealt with press requests, and, when necessary, yanked Musk out of meetings to keep him on schedule. She became the only bridge between Musk and all of his companies.