Dr. John Dvorak, PhD, worked on volcanoes and earthquakes for the U.S. Geological Survey, first at Mount St. Helens, then as a series of assignments in California, Hawaii, Italy, Indonesia, Central America and Alaska. He has written cover stories for Scientific American, Physics Today and Astronomy magazines, as well as a series of essays about earthquakes and volcanoes for American Scientist. Dvorak has taught at the University of Hawaii and lectured at UCLA, Washington University in St. Louis, the Lunar and Planetary Institute in Houston, and the Smithsonian Institution in Washington, D.C, among others

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