What's So Hot About Volcanoes (What's So Cool About Geology)
Wendell Duffield received a PhD in geology from Stanford University in 1967. During the following four decades, he studied volcanoes around the world as an employee of the U.S. Geological Survey. Now retired, Duff leads field trips, consults about geothermal energy, and writes books and articles for the general audience. Duff and his wife, Anne, spend summers in the lake country of northwestern Wisconsin and winters in Flagstaff, Arizona.