One of the comic book legends, I'd guess. I certainly hear his name often enough. Just looking down the list of characters he created and co-crated, he made... holy cow that's a lot... Captain America, Fantastic Four, Incredible Hulk, The Mighty Thor, Nick Fury, X-Men, The Avengers, Iron Man, Black Panther,Machine Man, The Eternals, Devil Dinosaur, Silver Surfer, Challengers Of The Unknown, New Gods (including Darkseid), Etrigan the Demon, Kamandi The Last Boy On Earth, OMAC The One Man Army Corps, and Kobra. And probably other stuff, too.
I wanna try making a Kirby krackle effect now.