I am a mathematician by profession and quite a long-time (since around 1995 – as of now , this means more than half of my life) TeX user by hobby.
I started with plain TeX, and much later (in the early 2000s) moved to LaTeX; I still use plain TeX occasionally (and when writing LaTeX classes/packages). Quite recently I also started to use ConTeXt.
I am a heavy Emacs user, though still a newbie – I started in 2001.
I have a blog about (among others) TeX and friends, located at http://mbork.pl/Content_AND_Presentation.