Okay, Father William is posted in the Rogue's gallery. I filled in the last two skill points to read and write Hebrew and Ancient Greek, tacked on some ammo for his pistol and a "poor box", and tweaked the background very slighty, adding his tendency to get rid of most of his reward money.
As far as what Father William's doing, he really only does three things as a rule: eat, preach, and kill. He could have met Andrew while tracking down a fugitive, or he has the option to meet just about anyone if they come into one of his services (he'll preach in hotel lobbies if he has to, or wherever he can get space, though God help anyone who doesn't put money in the poor box!)