My expertise is field geology and I specialize in physical volcanology. Over the years I have mapped the geology of many volcanic terrains in the Southwest. But I have found that the Mars-like geology of New Mexico has always held the greatest attraction for me. New Mexico has one of the greatest concentrations and variety of young volcanoes of any place on Earth. Add to that the variety of arid landscape features, and being in the field in New Mexico is like being on Mars.