Bachelor of Science in Biology/Chemistry (summa cum laude), Iowa Wesleyan College, 1981. Doctor of Philosophy in Biochemistry, Rice University, 1985.
Robert A. Welch predoctoral fellow Rice University, Houston, 1982—1985, Robert A. Welch Postdoctoral Fellow, 1985—1986. National Research Council resident research associate Johnson Space Center, National Aeronautics and Space Administration, 1986-1988, supervisor, biochemistry research group, KRUG International, 1988—1989, research biochemist, biomedical operations and research branch, 1989—1993, technical monitor, biochemistry research lab, biomedical and research branch, 1991—1993, payload element developer, bone cell research experiment (E10) aboard SL-J (STS-47), 1991—1992, United States-Union of the Soviet Socialist Republics Joint Working Group in Space Medicine and Biology, 1991—1992, project scientist Shuttle-Mir, 1993—1995, deputy division chief medical science division, 1993—1996, technical duties, astrounaut office operations planning branch, lead Crew Test Support Team in Russia, 1998—1999, deputy chief astronaut office, 2003—2005, chief station operations branch, astronaut office, 2005, back-up International Space Station Commander for Expedition 14, 2005—2006. Crew member Expedition-5 mission, 2002.
International Space Station (ISS) Commander for Expedition-16, launched aboard Soyuz Turnaround Management Association-11 spacecraft, docking with ISS, 2007. Adjunct assistan professor, department internal medicine and department human biological chemistry and genetics, University Texas Medical Branch, Galveston, Texas, 1991-1997. Adjunct assistant professor, Maybee Laboratory for Biochemical and Genetic Engineering, Rice University, 1997.
Selected for Space Station Redesign Team, 1993. Co-chair United States/Russian Mission Science Working Group, 1995-1996.
Member American Association Biochemistry and Molecular Biology, New York Academy of Sciences.
Married Clarence Felton Sams, May 6, 1989.