Elon Musk: "If somebody executes well, I'm a huge fan, and if they don't, I'm not.
I generally think it's a good idea to hire for talent, and drive, and trustworthiness. And I think goodness of heart is important—I undervalued that at one point.
So, are they a good person, trustworthy, and smart, talented, and hardworking. If so, you can add domain knowledge. But those fundamental traits, those fundamental properties, you cannot change."