Ed Viesturs summits all 14 mountains over 8000m
After 16 years of trying, Ed Viesturs
has become the first American to summit all mountains over 8000m
"). This, in itself, is an amazing achievement; however, even more remarkably, all of Viesturs climbs were done without supplemental oxygen (facilitated, in part, by his genetic abnormalities
The Eight-thousanders were first climbed in 1986 by Reinhold Messner
. Since then, only 12 other people have accomplished the same.