[JoeAltmaier]

I'd go further - exhibited personality is essentially acting. You can get better at playing parts. There is probably a baseline of the 'real you' that happens when you're not 'on', and we can assert that the real you never changes.

But functionally, almost everybody can learn to exhibit personality traits that benefit them personally and 'commercially'. You can be on for the interview, the meeting, the one-on-one. And you can conserve your energy when working at your desk or at home.