MEPAG is NASA's community-based forum designed to provide science input for planning and prioritizing Mars future exploration activities for the next several decades. It is chartered by NASA's Lead Scientist for the Mars Exploration Program at NASA HQ, and reports its findings at FACA-sanctioned meetings of the Planetary Science Subcommittee (PSS) of the NASA Advisory Council (NAC). Open to all interested members of the Mars exploration community, MEPAG conducts analyses of planning questions that are presented to it. MEPAG regularly evaluates Mars exploration goals, objectives, investigations and priorities on the basis of the widest possible community outreach. NASA's Mars Program Office, located at JPL, has been directed to manage the logistics associated with the operations of MEPAG on behalf of NASA's Science Mission Directorate. MEPAG holds open townhall-style meetings approximately twice per year.