The first event described as Everesting was by George Mallory, grandson of George Mallory, who disappeared on Everest in 1924. The younger Mallory ascended Mount Donna Buang in 1994, having ridden eight laps of the 1,069-metre hill. The format and rules were cemented by Andy van Bergen, inspired by the story of Mallory's effort. In the first official group effort, van Bergen organized 65 riders, 40 of whom finished the Everesting attempt.