Marco Einaudi was first a distance runner, rock climber, and mountaineer. These passions naturally led him to geology and a BA from Cornell in 1961. He then served as a US military intelligence officer in the Central Highlands of Vietnam, 1962-63. From Vietnam he went to Harvard for a PhD, received in 1968 based on his studies of Cerro de Pasco, Peru. Hired by Anaconda, Marco led the deep drilling and discovery of skarn ore at Carr Fork (Bingham) and contributed to the development of exploration models for porphyry and skarn (Bingham and Yerington). In 1975 he was appointed to the faculty at Stanford University, where he taught economic geology until retirement in 2003. At Stanford, Marco served as Chairman of Applied Earth Sciences and Associate Dean, School of Earth Sciences. He is a recipient of the Silver Medal and the Penrose Gold Medal from the Society of Economic Geologists, served as Editor of Economic Geology, and was a member of the Board on Earth Sciences and Resources, US National Research Council. His 22 MS and 33 PhD students continue to inspire and delight him. Since 2003 Marco has been busy writing, giving short courses to industry, and consulting on exploration projects around the globe. He lives with his wife, Meredith, in Stanford, California.