Marshall Ulrich is an American legend.
As a mountaineer, he's climbed the Seven Summits - completing each on his first attempt.
The Seven Summits consist of Mount Everest, Aconcagua, Denali, Kilimajaro, Mount Elbrus, Mount Vinson, Puncak Jaya, and Mount Kosciuszko by order of elevation.
Marshall has completed 130 ultra marathons, each over 100 miles in distance.
Most notably, he's known for completing the formidable Badwater 135 ultra marathon across Death Valley 18 times - winning the event 4 times - including 3 in a row.
Temperatures can reach 130 degrees F during this race in July.