David A CrownDavid A. Crown is a Senior Scientist at the Planetary Science Institute (Tucson, AZ), with professional interests in planetary geology, physical volcanology, remote sensing, and science education. His research studies focus on understanding the geoloic histories of the rocky planetary bodies in the solar system and include geologic mapping investigations of the surfaces of Mars, Venus, Io, and Ceres, use of spacecraft and airborne remote sensing data for geologic analyses of planetary surface features, field investigations of volcanic deposits, and the development and application of models for geologic flows. He has published nine geologic maps of Mars to-date, eight of which examined the geology of the Hellas region. He has conducted field studies of volcanic terrains in the western continental US, Hawai'i, Mexico, and in the Central Andes of Bolivia. Read More Read Less