Student (if you call that a “job”!).
Helped - enormously.
I’m sure it would have been far harder for me to be self-employed/running a business, without the benefits of academic discipline.
It perhaps helped a little that statistics and probability featured significantly in one of my degrees, but I don’t really look at it that way (I was probably just attracted to courses that featured statistics and probability because I was already trading a little).
The “academic discipline”, on the other hand, helped hugely.
It isn’t the specific stuff you learn at university that helps you to do any specific job, I think (unless you’ve done a vocational course of the law-school/medical-school kind, obviously, but I didn’t); it’s all the “how-to-learn” and “how-to-study” and “how-to-examine-evidence-and-draw-conclusions” skills you’ve acquired along the way that stay with you after the content-details have all been forgotten; they make all the difference in the world. There’s a reason that institutions, these days, are hiring as trainee traders people with good degrees from good universities.
I do support myself through trading, and it [I][U]is[/U][/I] my work.