Peggy Whitson

She is a NASA astronaut and biochemist who has taken part in two International Space Station missions. In 2007, she became the first woman to serve as commander of the space station. She also was the first woman to head NASA's astronaut corps. No other woman has spent more time in space.

In terms of goals for NASA before I die, we need to be living on Mars. And I might not live that long, so they better get with it!