Wendell Duffield received a PhD in geology from Stanford University in 1967. Ruing the following four decades, he studied volcanoes around the world as an employee of the U.S. Geol...lihat lebih banyakWendell Duffield received a PhD in geology from Stanford University in 1967. Ruing the following four decades, he studied volcanoes around the world as an employee of the U.S. Geological Survey. Also the author of Chasing Lava, Duff and his wife live in Flagstaff, Arizona.lihat lebih sedikit