In fact, his list of supposedly kick-ass activities appears to me to be someone who's trying too hard at concealing his true nerdiness, which, ironically, means he's a dork.
So there.
I’ve met him. You haven’t. Dr. Taylor is more like “hyperactive.” Can’t stop doing stuff. EVER. Back when Hank Rheinhart was still alive, it was fun to watch him learn to cut stuff (like helmets and mail shirts) with various sharp implements that Hank brought to Liberty Con.
As for “Geek” what about David Drake? I don’t think a former tanker, history professor and SF Author fits your image of geek.