On May 16 2007, Dr. Scott McIntosh reached the summit of Mt. Everest with an all Sherpa team. This team included record-holder Apa Sherpa who had summitted for the 17th time, and the speed record-holder Lhakpa Sherpa who raced from Base Camp to the Summit in under 11 hours. Along the way, Dr. McIntosh performed physiological tests on the Sherpas to help elucidate how and why the Sherpas function so well at high altitude. He has published research on Sherpa physiology as well as lectured widely on the subject.