Anatoli Nikolaevich Boukreev (Russian: Анато́лий Никола́евич Букре́ев; January 16, 1958 – December 25, 1997) was a Soviet and Kazakh mountaineer who made ascents of 10 of the 14 eight-thousander peaks—those above 8,000 m (26,247 ft)—without supplemental oxygen. From 1989 through 1997, he made 18 successful ascents of peaks above 8,000...