Bastian Grimm
Bastian Grimm is a German SEO consultant who focuses, primarily, on achieving valid, organic search results. After working a spell in the corporate world developing SEO strategy teams, he moved on to his own firm, Grimm Digital, which provides SEO training and consultation.
Grimm does a fair amount of English language blogging at StateofSearch.com and hosts his own, German language, blog at www.bastian-grimm.com. It’s probably fair to say that Grimm’s work isn’t really for beginners, but if you’ve got intermediate or advance SEO skills, you’ll definitely get a lot out of his work.