Chemical composition and chemistry of Solar System objects, including Mercury, Venus, Earth, Mars, Io, asteroids, and icy moons. Planetary geomorphology, including ice processes such as glaciation and periglacial processes on Earth, Mars, and beyond. Remote sensing and field studies of the world's glaciers and of mountain hazards such as glacial lake outburst floods, landslides, and earthquakes, especially in the Himalaya and other parts of High Mountain Asia. Planetary habitabilty.
Post doc, University of Arizona (Planetary Science), 1991-1992
Geologist, U.S. Geological Survey (Astrogeology Team), 1992-2005
Senior Associate Research Scientist, University of Arizona (Hydrology and Atmospheric Science), 2005-2018
Professor, adjunct, University of Arizona (Hydrology and Atmospheric Science), 2007-2018
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