Read Liftoff by Eric Berger about SpaceX. Musk is not an rocket engineer, but he was great at hiring engineers, motivating them, and willing to take risks in an field allergic to risk (for good reason, people die when planes and rockets crash.) most interesting to me was Musk’s management of their suppliers: he really streamlined the procurement process, which sped up development enormously. He was smart enough to understand what the engineers were doing and make decisions when they deadlocked, but he wasn’t the technical genius behind everything. Nothing wrong with that. In this day of specialization, he wouldn’t be human if he was doing all the technical work.