Commander: Michael J. Bloomfield
Michael J. Bloomfield, 43, a lieutenant colonel in the U.S. Air Force, a former instructor pilot and a veteran of two space flights, is commander for STS-110.

He received a bachelor of science degree in engineering mechanics from the U.S. Air Force Academy in 1981 and a master of science degree in engineering management from Old Dominion University in 1993.

He will be responsible for overall mission success and safety during STS-110, as well as the rendezvous and docking of Atlantis to the International Space Station. Bloomfield, and pilot Stephen Frick, will use the shuttle's robotic arm cameras to take video on the first, second and fourth spacewalks. They also will use the shuttle arm to support the EVA crewmembers during most of the third spacewalk.

Bloomfield will have primary responsibility for Earth observations, and will share responsibilities for the shuttle's guidance and navigation systems, computer systems and life support systems. He will land Atlantis at the end of the mission.

Selected by NASA in December 1994, Bloomfield has logged more than 494 hours in space, serving as pilot of STS-86 in 1997 and STS-97 in 2000. This flight will be his first as commander of a space shuttle mission.

Pilot: Stephen N. Frick
Stephen N. Frick, 37, a commander in the U.S. Navy, will serve as pilot. Frick received a bachelor of science degree in aerospace engineering from the U.S. Naval Academy in 1986 and a master of science degree in aeronautical engineering from the U.S. Naval Postgraduate School in 1994.

NASA selected Frick in April 1996. He will be responsible for a number of orbiter systems during ascent and landing. He will operate the shuttle's robotic arm with the commander, supporting the installation of the S0 (S-Zero) truss and the four spacewalks. Frick also will be at the shuttle controls for the undocking from the ISS and subsequent flyaround.

Frick will be making his first spaceflight.

Mission Specialist 1: Rex J. Walheim
Rex J. Walheim, 39, a lieutenant colonel in the U.S. Air Force and a former flight test engineer, will be Mission Specialist 1.

He received a bachelor of science degree in mechanical engineering from the University of California-Berkeley in 1984, and a master of science degree in industrial engineering from the University of Houston in 1989.

He was selected as an astronaut in March 1996. He will play a key role in the rendezvous, operating a handheld laser rangefinding device. Walheim and Mission Specialist Steve Smith will conduct the first spacewalk of the mission, on flight day four, and the third, on flight day seven.

Walheim will be making his first spaceflight.

Mission Specialist 2: Ellen Ochoa
Ellen Ochoa, 43, will be flight engineer and Mission Specialist 2, making her fourth spaceflight.

Ochoa received a bachelor of science degree in physics from San Diego State University in 1980 and a master of science degree and doctorate degree in electrical engineering from Stanford University in 1981 and 1985, respectively.

Selected by NASA in January 1990, Ochoa became an astronaut in July 1991. For the first, second and fourth spacewalks, she will move to the station's Destiny laboratory to operate Canadarm2, the station's robotic arm, to work with the spacewalking astronauts.

For the installation of the S0 truss, Ochoa and Expedition Four Flight Engineer Dan Bursch will work together to use Canadarm2 to lift the truss segment from Atlantis' cargo bay and attach it atop the station's Destiny laboratory.

A veteran of three space flights, Ochoa has logged more than 719 hours in space. She was a mission specialist on STS-56 in 1993, the payload commander on STS-66 in 1994, and a mission specialist and flight engineer on STS-96 in 1999.

Mission Specialist 3: Lee M.E. Morin
Lee M. E. Morin, 49, a captain in the U.S. Navy, will be Mission Specialist 3. Morin received a bachelor of science degree in mathematical and electrical science from the University of New Hampshire in 1974, a master of science degree in biochemistry from New York University in 1978, a doctorate of medicine degree and doctorate microbiology degree from New York University in 1981 and 1982, respectively, and a master of public health degree from the University of Alabama at Birmingham in 1988.

Selected as an astronaut candidate by NASA in April 1996, he reported to the Johnson Space Center in August 1996. Morin, teamed with Mission Specialist Jerry Ross, will participate in the second and fourth spacewalks on flight days six and nine, respectively.

Morin will be making his first spaceflight.

Mission Specialist 4: Jerry L. Ross
A retired Air Force colonel, Jerry L. Ross, 54, will be Mission Specialist 4 and will be making a record seventh flight aboard the shuttle, the most of anyone in history.

Ross received bachelor of science degree and master of science degree in mechanical engineering from Purdue University in 1970 and 1972, respectively.

He was selected as an astronaut in May 1980. Ross will be making his eighth and ninth spacewalks.

Ross was a mission specialist on STS 61-B (1985), STS-27 (1988) and STS-37 (1991), the payload commander on STS-55/Spacelab-D2 (1993), and a mission specialist on STS-74, the second space shuttle to rendezvous and dock with the Russian space station Mir (1995) and the first International Space Station assembly mission, STS-88, in 1998. Ross has logged more than 1,133 hours in space, including seven spacewalks totaling 44 hours and 9 minutes.

Mission Specialist 5: Steven L. Smith
Steven L. Smith, 43, a veteran of three spaceflights, is a mission specialist for STS-110.

He received a bachelor of science degree in electrical engineering in 1981, a master of science degree in electrical engineering in 1982 and a master's degree in business administration in 1987. All three degrees are from Stanford University.

Following his selection as an astronaut candidate by NASA in 1992, he completed one year of astronaut candidate training. Smith and Mission Specialist Rex Walheim will do the first spacewalk, on flight day four, and the third, on flight day seven. Smith will be making his sixth and seventh spacewalks.

Smith is making his fourth spaceflight. He served as a mission specialist aboard the space shuttle Endeavour on STS-68 in September 1994. He was one of two crewmembers trained to perform a spacewalk had one been required. He performed three spacewalks as a member of the February 1997 STS-82 Discovery crew which serviced the Hubble Space Telescope. He was the payload commander for STS-103 in December 1999, the Hubble Space Telescope 3A servicing mission.

The crew performed three spacewalks to return Hubble to science operations with several upgraded subsystems. Smith has logged 700 hours in space, including five spacewalks totaling 35 hours.