Clyde Wahrhaftig

Clyde A. Wahrhaftig (December 1, 1919April 6, 1994) was an American geologist who worked for the United States Geological Survey and taught at the University of California at Berkeley. His research areas included Alaska, the Sierra Nevada, and the California Coast Ranges. He is also known for his field guides to the geology of San Francisco and the Bay Area. Provided by Wikipedia