I've been playing D&D since the early- to mid-1980's. I am a purest in that I have really only played different renditions of D&D (basic set, master's set, advanced, 2nd, 3rd, 3.5, but not 4th or 5th).
I have been DM'ing (yes, DM'ing is the predecessor to GM'ing and I'm sticking with it) the same campaign for the past 7 years. I am hoping to eventually modify the campaign to 5th edition and re-run it for Roll20 folks.
My DM'ing and play styles are similar - roleplay!