Over the last year John Mueller has become the webmaster go to guy at Google for questions regarding website rankings. He has an outdated website about SEO tips that you can view here: http://johnmu.com/
He lives in Switzerland and often heads the Google Webmaster hangouts, where he answers questions from webmasters via comments and those joining him on the hangout.
He is a trends analyst at Google inc.
You can find him on Google plus: John Mueller