Humans to Mars Summit 2014

Miles O'Brien, science correspondant for PBS NewsHour, left, leads a panel discussion on Mars exploration with William Gerstenmaier, NASA Associatate Administrator for Human Explorations and Operations, center, and Michael Gazarik, NASA Associate Administrator for Space Technology, left, at the Humans to Mars Summit on April 22, 2014 at George Washington University in Washington, DC. Photo Credit: (NASA/Joel Kowsky)