I worked full-time as an analytical chemist in a forensic toxicology laboratory and part-time as a research technician in a neurochemistry laboratory in the Midwest USA. I've been using Wikipedia for years now, but only recently (June '07) started contributing. I generally focus on contributing to articles within my interests which include pharmacology, drug metabolism, neuroscience, chemistry, biochemistry, theoretical mathematics, artificial intelligence.....and whatever else I get into the mood for.
Additionally, I'm an avid tea drinker.
Also, I would like to thank everyone following behind me fixing all the junk I put up. I have a bad habit of adding articles/information without properly formatting or following style guidelines. I'm still learning.
Update: August 2014. I've moved out of the laboratory and now am working in the area of informatics data management.