Dr. Steven Squyres speaks at the National Portrait Gallery about his pioneering role in launching unmanned missions to Mars. Squyres is the principal scientist of NASA's Mars Exploration Rover (MER) mission, launched in 2003.
A portrait of Squyres by Susan Gamble and Michael Wenyon is on view in NPG's "Americans Now" exhibition, through September 25, 2011.
National Portrait Gallery
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