A veteran NASA astronaut, Tom is also a scientist, speaker, author and consultant. He holds a doctorate in planetary sciences, and, in more than eleven years with NASA, flew on four space shuttle missions. On his last flight, he led three spacewalks to install the centerpiece of the International Space Station, the American Destiny laboratory. Tom is a member of the NASA Advisory Council, serves on the board of the Association of Space Explorers, and is a regular on-air contributor for Fox News Channel’s spaceflight coverage.