François E. Matthes

François Émile Matthes [ – ] was a geologist and an expert in topographic mapping, glaciers, and climate change. He mapped remote areas of the American West for the United States Geological Survey (USGS). His maps coincided with the development of those areas into national parks. He is one of the founders of the Association of American Geographers and served as its president. Matthes resolved a dispute about formation of the Yosemite Valley and his findings on glaciers introduced the terms nivation and Little Ice Age.