John Grotzinger is a Professor of Geology and Geobiology, and the Division Chair for Geological and Planetary Sciences at the California Institute of Technology. Prior to moving to Caltech in 2005, he spent 18 years as a member of the faculty at MIT, where he was Robert Shrock Professor of Geology. At Caltech his research group studies the co-evolution of surficial environments on Earth and Mars. Field mapping studies are the starting point for more topical laboratory-based studies involving geochemical, geologic, and geochronological techniques. He served as the Chief Scientist for the Mars Curiosity Rover mission from 2007-2015. Grotzinger is looking forward to working with the Mastcam-Z team in deciphering the geology of the Jezero crater landing site.