Walter Parry Haskett Smith (1859-1946)
He invented British rock climbing. Allegedly.
Haskett Smith was certainly not the first chap to go rock climbing, but he is usually credited with inventing the modern concept of the sport. He had the radical idea of not bothering to go all the way to the top. Instead, he put the rock climbing cart firmly before the mountaineering horse of the day and decided it was much more fun simply to climb routes for their own sake, rather than as a bit of pratting about before going on a European mountain holiday.