Andrew Knoll is a member of the Mars Exploration Rover science team and Fisher Professor of Natural History at Harvard University. His research focuses on ancient rocks on Earth; he studies how well they preserve evidence of ancient terrestrial life. Shortly after Opportunity landed on Mars, Astrobiology Magazine’s Editor-in-Chief, Henry Bortman, spoke with Knoll about the scientific potential of the Opportunity landing site. In this interview segment, Knoll discusses how iron deposits near the Rio Tinto in Spain could help scientists understand the history of the hematite deposits on Mars. In the second segment, Knoll will discuss the possibility that Opportunity could find signs of life.