PhD in Physics (but quite a long time ago :-). Working in online business since 1998. Webfield Consulting: online marketing, field studies, keyword discovery, search-engine optimization, search-engine marketing, Google AdWords, regional advertising, performance marketing, web analytics, Google Analytics, conversion tracking, user tracking, analysis, evaluation, expert reviews, web usability, information architecture. Certified Google AdWords Partner, Google AdWords Expert, Google Analytics Individual, Top Contributor German Google AdWords Help Forum, SMX speaker, Top 100 SEO agency in Germany. Webfield Academy: seminar trainer for Google AdWords, Google Analytics, and SEO.