@Doug Stewart - Nikolay Bachiyski (oop or not to oop) is a Bulgarian. Vitaly Friedman is an European too (his slides aren’t listed here though). The presentation about underscores and git was held by Germans http://www.slideshare.net/KirstenSchelper/wordcamp-europe-2013-git-wordpress and Vladimir Prelovic http://2013.europe.wordcamp.org/speaker-vladimir-prelovac/ is from Serbia