According to Wikipedia, George R.R. Martin was selected by Time Magazine as one of the "2011 Time 100" which is their listing of the most influential people of the year.
With "Game of Thrones" on HBO returning and a host of other multimedia projects of his in the works, it seems a fair assessment.
As a high-schooler, though, Martin contributed in varying degrees to many popular comic and SF fanzines of the day.
These have been listed at his site: http://georgerrmartin.com/collectors.html. There isn't much in the way of visuals save a pic of Star Studded 7 which is probably making those in fandom heaven roll their eyes in disbelief! The one issue Martin put up is the one that had 2 of it's color plates reversed by accident in the printing process so the result was not what the Texas Trio had intended. (I like it myself, as is) So, being the only fanzine SuperSite on the web, the good ol' Captain is going to fix this problem for fans of fanzines and of GRRM by posting as many of the listed fanzines as are at my disposal. I will note the ones missing and if you have it or know where I can get it, give a holler!
First set is from Martin's list of his LOC's (letters of comment):
ROCKET'S BLAST #24, October 1963
ROCKET'S BLAST #25, December 1963
Missing: THE COMIC WORLD NEWS #7, January 1964
ROCKET'S BLAST #28, March 1964
THE COMIC WORLD NEWS #9, March 1964
THE COMIC WORLD NEWS #10, April 1964
KOMIX ILLUSTRATED #12, April 1964
Missing: THE COMIC WORLD NEWS #11, May 1964
FIGHTING HERO COMICS #10, June 1964
ROCKET'S BLAST - COMICOLLECTOR #31, June 1964