European Space Agency astronaut Frank De Winne served as commander for Expedition 21 and flight engineer for Expedition 20. De Winne spent nine days aboard the station in 2002 as a member of the Odissea mission.› Biography →
Astronaut Jeffrey Williams served as a flight engineer for Expedition 21 and commander of Expedition 22. He previously resided on the space station for six months in 2006 as a member of the Expedition 13 crew.› Biography →
Canadian Space Agency astronaut Robert Thirsk served as a flight engineer for Expeditions 21 and 20. In 1996, Dr. Thirsk flew as a payload specialist astronaut aboard space shuttle mission STS-78, the Life and Microgravity Spacelab mission.› Biography →
Cosmonaut Roman Romanenko served as a flight engineer for Expeditions 21 and 20. He was selected as a test-cosmonaut candidate of the Gagarin Cosmonaut Training Center Cosmonaut Office in December 1997. In November 1999, he was qualified as a test cosmonaut.› Biography →
Astronaut Nicole Stott served as a flight engineer for Expeditions 21 and 20 after launching on STS-128. In April 2006 she was a crew member on the NEEMO 9 mission where she lived and worked with a 6-person crew for 18 days on the Aquarius undersea research habitat.› Biography →
Cosmonaut Maxim Suraev served as a flight engineer for Expeditions 21 and 22. He was selected as a test-cosmonaut candidate of the Gagarin Cosmonaut Training Center Cosmonaut Office in December 1997.› Biography →
Canadian Guy Laliberté flew to the International Space Station aboard Soyuz TMA-16 and returned on Soyuz TMA-14 under a commercial agreement between the Russian Federal Space Agency and Space Adventures, Ltd.
Astronaut Jeff Williams, aboard the International Space Station 220 miles above Earth, is taking your questions. Post a video response with your question at ReelNASA on YouTube. Williams' schedule will not allow him to answer many questions, but he will attempt to answer a few each week.› View This Video
Visit the Expedition 21 photo gallery.
Visit the space station photo gallery to see collections of images that capture the orbital outpost's history.