This is an interesting thread and has the makings of a very educational and useful one.
The aviation industry as you know, uniquely has a broad spectrum of personnel from a variety of industries.
I come from a Maths and business development background which I combine with some charter flying to give me some variety.
It would be fantastic to hear of other professions you good people have come from/still do , or may even go back to at a later date? (and what were/are the good and not so good aspects of your non-flying positions).