Sounds like you want a capital-P Professional, but one who is willing (and permitted) to do direct consulting.
That's pretty much lawyers and doctors, then nothing for about 80% of the distribution because those people are W2 and have neither the time nor the leeway to do solo consulting. Then you're into the ultra-specialist fields, at which point they have an agent.
So I would say, you don't want to find a person, you want to find an agent who has such a person, and odds are starting fees are $5k going on $1M.
That's pretty much lawyers and doctors, then nothing for about 80% of the distribution because those people are W2 and have neither the time nor the leeway to do solo consulting. Then you're into the ultra-specialist fields, at which point they have an agent.
So I would say, you don't want to find a person, you want to find an agent who has such a person, and odds are starting fees are $5k going on $1M.