Michael George owner of the Guru Effect really knows his stuff and share the information freely in his Blog. I am also impressed with the way he is quick to get on the phone to walk you through an issue. Michael shared some plugins for my Word Press site which has been very helpful to me.
I would highly recommend his services to anyone needing SEO assistance.
There is also a fun side to him as you can see on the Foodie community on G+, he is passionate about cooking.