[SirChainsaw]

He seems to recognise that he _isn't_ an expert in everything and takes the Carnegie approach of surrounding himself with smarter people than him.

He also doesn't (as the article suggests) manage SpaceX or Tesla etc. The day to day management is delegated to those who are experts at management.

His title at SpaceX is Chief Engineer and his title at Tesla is Product Architect.

[DerekBickerton]

How could he be an expert in every area? Unless he's some supernaut. He spreads himself thinly over many disciplines. Nothing wrong with that. He could choose to be hyperfocused on one area, but that would be at a detriment to the other areas.