There is chapter in this book, Strange and Dangerous Dreams: the Fine Line Between Adventure and Madness by Geoff Powter, which is about mountaineering. Crowley was an accomplished mountaineer, although a poor team member. He reached a creditable height on K2 very early on, but treated fellow climbers and porters with contempt.
In fact, the first serious attempt to climb K2 was undertaken in 1902 by Oscar Eckenstein and Aleister Crowley via the Northeast Ridge.
The author examines Crowley psychologically in an interesting way, without being a rabid 'follower' or a dismissive critic, and details his career as a climber.
You can read much of the chapter here: