Rick Husband
 Payload commander, age 45. An Air Force colonel from Amarillo, Texas. Former test pilot selected as an astronaut in 1994 on his fourth try. Married father of two. »NASA Bio | William McCool
 Pilot, age 41. A Navy commander from Lubbock, Texas. Became an astronaut in 1996. First spaceflight for McCool, who was married with three sons, ages 22, 19, 14. »NASA Bio | Michael Anderson
 Payload commander, age 43. Chosen in 1994 as one of only a few black astronauts. Lieutenant colonel, lived in Spokane, Wash., handled science experiments. Married with children. » NASA Bio |
Kalpana Chawla
 Age 41. Immigrated to the United States from India in the 1980s; became an astronaut in 1994. Previous mission as robotic arm operator on STS-87 in 1997. »NASA Bio »Embassy of India |
David Brown
 Age 46. Navy captain, pilot and doctor. Joined the Navy after medical internship; went on to fly A-6E Intruder and F-18. Became an astronaut in 1996. Columbia´s mission his first spaceflight. »NASA Bio | Laurel Clark
 Age 41. A flight surgeon before she became an astronaut in 1996. Had been on Columbia to help with science experiments. Lived in Racine, Wis., married with an 8-year-old son. »NASA Bio »Dr. Laurel Clark Memorial Website |