Dr. David Des Marais is a senior space scientist at NASA Ames Research Center. He has investigated the geochemistry of lunar samples, meteorites and both volcanic and ancient sedimentary rocks from Earth. He coordinated a long-term study of benthic cyanobacterial microbial ecosystems. David is Principal Investigator of the Ames Research Center Team of the NASA Astrobiology Institute. He is currently a member of the science teams of NASA’s 2003 Mars Exploration Rover mission, the 2005 Mars Reconnaissance Orbiter mission, the 2011 Mars Science Laboratory mission and the 2016 ExoMars/Trace Gas Orbiter mission. He has published more than 160 technical articles and chapters on these topics. David is Chair of NASA’s Mars Exploration Program Analysis Group.