Gregg Rabideau is a researcher and software developer in the Artificial Intelligence Group at the Jet Propulsion Laboratory, California Institute of Technology. He is currently working on the Mars 2020 On-Board Planner. His research interests include plan optimization, continuous re-planning, and flexible plan execution. He holds B.S. and M.S. degrees in Computer Science from the University of Illinois where he graduated with highest honors. Over the years, Gregg has made significant contributions to four projects that have received an award at the NASA Software of the Year Competition: ASE, Sensorweb, ASPEN, and the Remote Agent Experiment.