Having said that I do know a few smart people who work on the boards of various companies.
A good friend was a research physicist for years and is now basically unemployed but does some part time work tutoring kids in maths and taking groups of kids to do outdoor activities. If you are really smart would you be working 12 hours a day in an office?
He says he gets more than enough for living and it is a "very peaceful life and it's easy to meet new people".
My cousin who was a child prodigy became a buddhist and now teaches music.
One works for a bank in AI/ML, one is a broadcaster and author, another had their own small boutique consultancy that has just been bought by a slightly larger boutique consultancy.
The smartest software developer I ever knew hopped around several FAANGs and MSFT, sort of round robin, driving up his pay and rank. Somewhere along the way he bought a building and became a property manager on the side.
- cloistered nun (majored in theoretical astrophysics, not sure how this happened)
- stay-at-home mom of 3
- jazz professor
- composer
This was a fun exercise and I was surprised by my answers. I couldn't honestly think of anyone in "high prestige" careers (e.g. finance, mgmt consulting) that I actually think are smart.