Tom Holzel graduated in Economics at Dartmouth College, New Hampshire. In 1986 he organised and took part in an expedition to the north side of Mount Everest to search for new evidence of what became of Mallory and Irvine. He has invented and patented a new kind of oxygen 'rebreathing' apparatus for extended use at high altitude. He is the author on numerous articles forSummit,MountainandAmerican Alpine Journal.
Audrey Salkeld has the most comprehensive archive in Britain on mountaineering. She has translated from the German books by Reinhold Messner and Kurt Diemberger and has written the scripts for a number of television documentaries, including Leo Dickinson'sEigerand David Breashear's filmThe Mystery of Mallory and Irvine, for which she took part in Holzel's 1986 expedition and climbed to the North Col on Everest. She contributes regularly to mountaineering journals and is the author of a highly praised book on her Himalayan travels in Mustang and Tibet,People in High Places.