DR. SCOTT MESSENGER is a Space Scientist whose expertise is in isotopic analyses of extraterrestrial materials by secondary ion mass spectrometry (SIMS). His research interests include the nature and origin of materials in the solar nebula and preserved interstellar matter and stardust from comets and meteorites. Scott works closely with Dr. Lindsay Keller and Dr. Simon Clemett, to coordinate isotopic studies with mineralogical studies by transmission electron microscopy and organic analyses by resonance ionization mass spectrometry and other spectroscopic techniques. Scott will be involved with the analysis of cometary dust returned by the Stardust spacecraft in 2006. Scott received a B.S. in Astronomy and Physics from the University of Washington (1991) and a Ph.D. in Physics from Washington University in Saint Louis (1997). His graduate work focused on isotopic analyses of molecular cloud materials and stardust extracted from meteorites and interplanetary dust particles. His dissertation was titled "Combined Molecular and Isotopic Analysis of Circumstellar and Interplanetary Dust." Scott was a National Research Council Fellow at the National Institute for Standards and Technology from 1997 - 1999, developing techniques for isotopic measurements by time-of-flight SIMS. He subsequently rejoined his graduate research group at Washington University where he worked with the first NanoSIMS ion microprobe. Scott joined NASA in 2003. Some selected publications: Messenger S., Keller L. P., and Lauretta D. S. (2005) “Supernova olivine from cometary dust.” Science, in press. Messenger S., Keller LP, Stadermann FJ, Walker RM and Zinner E. (2003) "Samples of stars older than the Sun: silicate grains in interplanetary dust particles," Science 300, 105-108. Messenger S., Stadermann F.J., Floss C., Nittler L.R., and Mukhopadhyay S. (2003) "Isotopic signatures of presolar materials in interplanetary dust," Space Sci. Rev. 106, 155-172. Messenger S. (2002) "Opportunities for the stratospheric collection of dust from short-period comets," Met. Planet. Sci. 37, 1491-1505 Messenger S. 2000, "Identification of Molecular Cloud Material in Interplanetary Dust Particles" Nature 404, 968-971. Messenger S., Amari S., Gao X., Walker R.M., Clemett S.J., Chillier X.D.F. Zare, R.N., and Lewis. R.S. 1998, "Indigenous Polycyclic Aromatic Hydrocarbons in Circumstellar Graphite Grains from Primitive Meteorites." Astrophys. J. 502, 284-295. Messenger S., and Walker R.M. 1997, "Evidence for Molecular Cloud Material in Meteorites and Interplanetary Dust." in (T. Bernatowicz and E. Zinner eds.) AIP conf. Proc. 402, Astrophysical Implications of the Laboratory Study of Presolar Materials, 545-564

Scientist Cosmochemistry, Astrophysics VOICE: 281-244-2786 FAX: 281-483-1573 EMAIL: scott.r.messenger@nasa.gov NASA Johnson Space Center Mail Code KR Houston, Texas 77058