I've traveled to and edited OpenStreetMap on the ground in over 30 countries around the world. I am particularly familiar with the Caribbean, Central/South America, Middle East, and the western US. I've been working with OSM since 2009.
I am also a certified Geographic Information Systems Professional (GISP) with 12+ years of experience in the private and public sector. Skilled in cartography, data management and analysis, standards, remote sensing, multiple GIS platforms (ESRI, Manifold, QGIS, JOSM), online GIS, OpenStreetMap (of course), and successfully driving on jungle mountain roads in foreign countries - at night - in the rain.
My OSM stats: http://hdyc.neis-one.org/?Canyonsrcool
My heat map: http://yosmhm.neis-one.org/?Canyonsrcool
I edit all over the world, but countries I have visited personally and in which I edit OSM include:
USA (Intermountain West)
Turks & Caicos
Trinidad & Tobago
United Arab Emirates