Vladimir Kovalik (rafting)
Yeah, he's my dad and I'm proud of him, so take this with a grain of salt but... He rowed the GC a few years back at 80 and, unlike his dear friend Martin Litton (HUGE respect to Martin for all he's done!) he rowed every inch of it himself, and in a boat of his own design. We made him scout Lava and Crystal even though he didn't want to. Totally clean runs the whole trip.
And speaking of designing things, he virtually created the modern whitewater raft. Here are the things he came up with in the '70's that are still the norm for today (all "standard" style rafts, versus cataraft style):
1972: Continuous curved ends (versus "stove pipe" construction)
1972: Laced in thwarts (cross tubes: prior to this they were glued or buttoned in)
1973: Standard raft frame utilizing a cooler for the seat, along with suspended floors for heavy boxes.
1974: Laced in self bailing floors (HUGE leap in design!)
1974: Type V Commercial PFD (the coast guard actually created the Type V category based on his designs).
I'm sure there are more but that's the quick list.