This is a book by Ashlee Vance, a famed tech writer. Initially I thought the writer is a female!
Elon likes to think from the first principle. The whole space rocket can be boiled down to the physics. Instead of improving the existing rockets, his company built everything from scratch, minimizing cost of each component, and increase efficiency by thinking about how to change fundamental things. One thing that is different also, is that, every component in the rockets or cars he built is built in house.
At one point after reading, I am sort of in sync with what he is talking about, the plan to have human live on Mars, the steps he envisioned to achieve that, after he tells you about the that, you can actually see how this can be done.
Elon is hard on people, people may have his vision like myself, but I doubt I want to work with him.