Sean O'Rourke defended his PhD thesis in 2009 (so he is a doctor) and instead of starting a job, immediately moved into is car so he could climb more mountains (thus he's a legit dirtbag too). And those 18 FKTs?

"I’m a so-so runner and climber who has found a niche and focused on it."

Nice work Sean! Dr Dirtbag has since written a book, bike-packed in South America, and ... lives out of a slightly larger car.

"I am pretty good at objectives with: (1) enough climbing to keep the runners away; (2) enough running to keep the climbers away; and (3) no money to be made."

Thanks to sponsors PATH Projects (www.pathprojects.com) and Athletic Brewing Co. (www.athleticbrewing.com)