Wikipedian Krzysztof P. Jasiutowicz - based in Częstochowa, Poland, a GP by profession, hooked on Wikipedia.
I can't deny that: I am one of Wikipedia old-timers, I care very much for Wiki(p)media and there are only very rare days that I don't contribute, copy-edit, refractor or hunt vandalism in one or the other Wikimedia projects.
In 2004 I (with Paweł Jochym) was awarded The Internet Citizen of the Year Award for my role in the Wikipedia-PL inception.
also contributions to English Wikiquote, Wikibooks and Wikimedia Commons
In 2010 I was one of the participants of Wikimania 2010 in Gdańsk. Occasionally I have helped in various translation assignments (mainly English-Polish).
Slavic Wikipedias coordinator. See Slavopedia (defunct).