Andrew Lock is Australia's most accomplished high altitude mountaineer and widely recognized as one of Australia's most competent Mountain Climbing and Remote Area trekking guides. His expertise as an international expedition leader and logistician to destinations around the world is highly sought after, with a resume that includes leading successful expeditions to Heard Island, Central Asia, South America, Mt Everest's summit and remote areas of nearly every continent on earth.

As the most accomplished high altitude mountaineer in Australian history, his achievements encompass 16 summits of 8000 metre peaks, including Mt Everest (twice) and eleven other of the world's fourteen 8000 metre peaks, more than twice that of any other Australian, placing him in a select group of the world's best alpinists. Additionally, Andrew accomplished the first Australian ascent of 5 of those mountains, a record that can never be broken.