Without checking the link, which discipline do you think is #1? https://www.forbes.com/sites/chasewithorn/2023/04/29/these-are-the-richest-americans-with-a-phd/?sh=b0d283e2cd96
Without checking, I suspect it's a STEM discipline. How about physics? (After checking) Oh, engineering. Okay. None in higher education or HRD. Hmmm....I guess I'll just have to go back to school, then. No way around it.