I am uncommonly mobile; I have circumnavigated the globe eight times, walking amazing distances. Through the South Island of New Zealand to the Southern Alps. From Chile to the Andes in Argentina. Across the Serengeti in Africa. I made 300 ascents of mountains 10,000 ft. tall or more, including the Matterhorn, Mont Blanc, and Kilimanjaro. I traveled alone, aided only by my porters, sketching volcanos and collecting wildflowers along the way.