BASIC programmer?
I'm not had formal training in Mathematics beyond High School, though I've worked my way though introductory texts to Calculus (single variable), Linear Algebra and Discrete Mathematics (thanks in a large part to reading Yegge's rants and being inspired to learn by the exceptionally smart people on HN - really, I now wish I'd pursued Mathematics further, was in the top 5% at high school but didn't enjoy it).