Well, not a complete lurker, posted a couple of thoughts following the rabbinical dictum of "the bashful shall not learn" - I have sizable if somewhat weird jewish orthodox background. I guess that is a domain of expertise by itself.

More recently I made a career switch from general programming to reporting to data mining types of stuff (this was a planned transition over 3 years). Still way behind on many mathy things but know enough to be useful to my employer. Learned pretty much everything myself, though I have gone to a low-quality college while being a "non-degree rabbinical student" (a yeshiva bachur not aiming for smicha in the lingo).

I don't have any rational superpower yet, but search for truth and some fortuitous accidents brought me thus far, so who knows ;)