Napoleon Hill wrote about the power of mastermind groups and reported how Andrew Carnegie (the richest man in the world at the time) and others were using mastermind groups to their advantage.
Mastermind groups work in lots of places and lots of ways.
As Napoleon Hill wrote, you don’t even need the people in your mastermind group to be physically present or even alive to be in your group. Doing that makes your “group” an advanced form of talking to yourself but definitely works – I’ll talk about it a bit more later.