Wendell A. Duffield received a PhD in geology from Stanford University in 1967. During the following three decades, he studied volcanoes around the world as an employee of the U.S. Geological Survey. Duff teaches geology at Northern Arizona Unviersity, consults about geothermal energy, and writes books and magazine and newspaper articles for a general audience.
Duff and his wife, Anne, their dog (Pele), and cat (Marza) spend summers in the beautiful lake country of northwestern Wisconsin and winters in mild Flagstaff, Arizona.
