Check out the documentary WHO IS TAKI 183 directed by Jim Prigoff and Cedric Godin featuring Taki 183, the Greek-American writer based in New York and other figures like Cornbread from Philadelphia.
Taki 183 started tagging his neighborhood in the 1960s and you can definitely say that he is one of the guys who started all this.

You can still see the adrenaline bursting in his eyes in retrospect.