On 24 May 2014 he became the first known vegan to ascend Everest. As of October 2019 he is attempting to become the first known vegan to summit the 14 highest summits on Earth and has successfully reached the top of 10 of them: Everest (north and south routes), Manaslu, Annapurna, Makalu, Lhotse, Cho Oyu, Kangchenjunga, Gasherbrum I, Gasherbrum II, and Dhaulagiri.