I recently made a contact for a potential job offer, and I have been addressing him with the "Dr." (he holds a doctorate). Let's say his name is "George McKee", then on his blog, website, and LinkedIn, he is referred to as "Dr. George McKee". I have been addressing him as "Dr. McKee" in our emails, and I noticed that he signs his name with a "g" (for "George") at the end of his emails. Does this mean I can/should call him "George"?
We have not met in person, but most people that know him call him "George".
Also, I am located in the United States, West Coast / Pacific North West
Most of the answers/comments here are right in that I am over-thinking the situation. Perhaps I'm a bit socially anxious around well-educated or professionally accomplished people, as I've never known one personally. I'm the first in my family to venture into the "white-collar" or "college-educated" world, and I haven't had any mentors that understand this problem. I'm just trying to learn the etiquette without sounding robotic/awkward. Hopefully others will find this useful.