The Guy Mariano story might be one of the most incredible stories in the history of skateboarding (thus far). Just watch the Epicly Laterd series in this playlist to understand why.
Or you can read about it here...(in a short condensed version :)
Basically, Guy started out on Powell Peralta back in the late 1980s. He was in a skate video called "Ban This". Stacey Peralta (co owner of Powell Peralta) knew that Guy was a natural skateboarder when he was just a kid. Stacey was responsible for scouting Tony Hawk and Steve Caballero too.
Now to understand what a natural he is, just watch his Video Days part. That came out in 1991, when Guy was about eh... I would say 14 or 15. If you watch his lines and his style - you'll understand that type of skating was light years ahead of it's time.
Flash 5 years later and you'll notice his Mouse part is still legendary. I see a similarity between Guy and Tom Penny, but maybe that's just me. They both have that effortless style and that mysterious way about them.
Not too long ago, Guy went through some very tough times in his life. He somehow got through it and made an insane come back part that's unreal. Just watch the Epicly Laterd videos - it's seriously mind blowing.