Daniel Lee Mazur is a mountain climber, expedition leader, and philanthropist who has ascended nine of the world's highest summits, including Mount Everest and K2.

[10] Mazur has led more than 11 expeditions to Everest[8] and was a leader of Greg Mortenson's team that attempted to summit K2 in 1993, which is featured in the book Three Cups of Tea.

[17] In 1991, during an expedition that summited Mount Everest with Anatoli Boukreev, Mazur played a pivotal role in the rescue of Georgian climber Roman Giutashvili.

Rob Hall, Scott Fischer, Ed Viesturs, Neal Beidleman and Jon Pratt also assisted in the high altitude rescue.

[19] At 7:30 am on May 26, 2006, Mazur and his fellow ascending climbers, Andrew Brash (Canada), Myles Osborne (UK) and Jangbu Sherpa (Nepal), were eight hours into their planned ascent to the summit up the North Ridge of Mount Everest.

The group determined that he was suffering from symptoms of cerebral oedema, frostbite and dehydration as he was hallucinating, mumbling deliriously and appeared generally incoherent in his responses to offers of help.

The rescuers replaced the hat, jacket, and gloves Mr. Hall had discarded, anchored him to the mountain, and gave him their own oxygen, food and water.

[24] Each year Mazur leads and organizes groups of volunteers to visit, bring supplies, medicines, health care and education to the Himalayas.

The project aims to reduce the environmental impact of human waste in the Everest region by developing and installing solar-powered biogas digesters suitable for the high-altitude conditions.