Mary Beth Brown seems like a real champion. I find it amazing that in this current "women in tech" climate she hasn't achieved god status. I think as people learn more about her, she will become more of a public figure. She is already a kind of hero / superstar in my view.
A lot of people have described her as a Pepper Potts to Elon Musk's IronMan. Honestly, Pepper Potts' job seems weak compared to the things that Mary Beth Brown had to deal with. Keep in mind, Mary Beth Brown is an actual person :D
Here are some things I learned about her that I really like. It seems she has been most influential in building company culture at SpaceX.
(will think about this more and add later, let me know if you have more suggestions).
Last I've heard, she was laid off. The story goes like this (I don't know any of these people, I only read things). Mary wanted to get a raise so she asked for one from Elon. Elon said she should take a vacation so he can see how hard her job really was. If it was a hard job, then he'd give her a raise. Apparently when she was gone, he must not have missed her much, because he refused to give her a raise. This was basically firing her and she never returned to SpaceX to work again.
I have also heard rumors that Brown being laid off / quitting had more to do Talulah Riley (Elon's current wife) being jealous of how much time Elon and Mary spent together, which is sorta understandable. I really hate gossip but just imagine if IronMan had a wife and it wasn't Pepper Potts...?
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I'm summarizing all the points I think are interesting about the Elon Musk biography here:Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future: Book Summary
You can see more information about the book itself here: Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future: Ashlee Vance: 9780062301239: Amazon.com: Books