Professional papers of Peter Smith, Senior Research Scientist and Professor Emeritus, University of Arizona Lunar and Planetary Laboratory. The collection predominantly documents the development of scientific instruments and the project management of missions to the planet Mars including Pathfinder, the Mars Surveyor Program and the Phoenix Mars Mission with the National Aeronautics and Space Administration and the Jet Propulsion Laboratory. The papers include extensive research materials, data, correspondence, publications, grant proposals, workshops and conferences, education and public outreach activities and media coverage.