The Mars Exploration Program (MEP) is a long-term effort to explore the planet Mars, funded and led by the U.S. space agency, National Aeronautics and Space Administration (NASA). Formed in 1993, MEP has made use of orbital spacecraft, landers, and Mars rovers to explore the possibilities of life on Mars, as well as the planet's climate and natural resources. The program is managed by NASA's Science Mission Directorate by Doug McCuistion of the Planetary Science Division.