I am a French computer engineer, living in France.
I joined Wikipedia in December 2005, and the Atelier Graphique (the French Graphic Lab) in 2007. First it was to create maps of the Marquesas Islands, so I followed the tutorials made by Sting (see above). Then, I continued to draw maps, and also diagrams and schemes, on various subjects.
My favourites softwares are Inkscape and the Gimp, and GlobalMapper & 3Dem for the maps.