- My overarching research theme continues to be geological processes that have affected the terrestrial planets. I have continued studies of water on Mars through hydrologic, geologic, and geomorphic analyses of the valley networks and deltas. A second main area of research involves the geochemical history of Mars. Recent field campaigns to Central American volcanoes were completed to assess the geochemical pathways of chemical alteration. We are also completing laboratory experiments and geochemical modeling that represent this natural system and similar environments on Mars. Planetary geologic mapping represents another area of research. Moreover, I have been studying impact craters to better address the history of planets. In addition to the field work in Nicaragua/Costa Rica/Iceland I led a Mars Rover simulation in Utah this past October.