For rowing I have to say Prince Helfrich, the Pruitt Brothers and crew for pioneering modernday style multiday trips on all those great wilderness runs in Idaho and Oregon. I mean you are out in the upper owyhee in the middle of no where and maybe you see another group of 3 people on a week long trip and you feel like you were the first one there almost, then you see the cable rigged at cable rapid, and you remember that these guys were running wood drift boats down this over 70! years ago. These guys were putting drift boats on just about anything they could find with a multiday canyon.
For kayaking I have to go with Royal Robbins and crew because of their badassness in both the wilderness kayaking and bigwall climbing worlds.