Matthieu Gounelle obtained a DEA in nuclear isotopic, chemical, and mineralogical studies of , interplan­ physics (1994) and a DEA in philosophy of science etary dust particles, and Stardust mission samples. He has worked for (1996). He received his Doctorat de Physique from NASA at the Johnson Space Center since 2003, where he has established the Université Denis Diderot (Paris 7) in 2000. His a NanoSIMS 50L ion microprobe laboratory. interests span a broad range of topics in cosmo­ Ann N. Nguyen received her PhD from Washington chemistry and astrophysics. He has worked on the University in St. Louis in 2005. Her focused possible cometary origin of the Orgueil CI chon­ on the analysis of presolar silicate grains. She com­ drite and the link between and . pleted a postdoc with Larry Nittler at the Carnegie He is a professor at the Museum National d’Histoire Naturelle, Paris. Institution of Washington and is currently a staff He was awarded the Nier Prize by the Meteoritical Society in 2006. member in the Astromaterials Research and Weifu Guo received his PhD degree in geochem­ Exploration Science Division at Johnson Space istry from the California Institute of Technology Center, Houston, Texas, USA. in 2008. His thesis work dealt with the develop­ ment and applications of carbonate clumped-­ John F. Rudge is a research fellow in the Department isotope thermometry, under the supervision of Dr. of Earth Sciences at the University of Cambridge. John M. Eiler. He is currently a Carnegie postdoc­ He did his undergraduate and graduate training in toral fellow at the Geophysical Laboratory of the Cambridge, earning a BA in mathematics and a Carnegie Institution of Washington. In addition PhD in Earth sciences. He recently returned to to clumped-isotope geochemistry, his research interests include the Cambridge after postdoctoral positions at Columbia understanding of mass-dependent and mass-independent sulfur isotope University, Yale University, and ETH Zürich. He is fractionations in various geological and planetary systems. He will join a theoretician with wide-ranging interests in the the Woods Hole Oceanographic Institution as an assistant scientist in Earth Sciences. A particular focus of his research is to understand the 2011. quantitative constraints on Earth’s evolution provided by isotope geo­ chemistry. Thorsten Kleine received a Dr. rer. nat. with honors from the Westfälische Wilhelms-Universität Douglas Rumble III has been a staff scientist at Münster, Germany, in 2004. He was a research the Geophysical Laboratory since 1973. He uses associate and then an assistant professor at ETH the stable isotopes of oxygen and sulfur in ancient Zürich, Switzerland, and in 2009 he moved back rocks to explore the evolution of Earth’s atmo­ to Münster as a University Professor of Planetary sphere, and he studies these isotopes in meteorites Sciences at the Institute of Planetology. His research to understand the origin of the Solar System. He aims at understanding the origin and evolution of obtained a PhD in geological sciences from Harvard the Solar System and the accretion, differentiation, and thermal evolu­ University in 1969 and a BA in geology from tion of asteroids and the terrestrial planets. He received the F. W. Clarke Columbia University in 1964. Award from the Geochemical Society in 2010. Edward R. D. Scott is a planetary scientist in the Dante S. Lauretta is an associate professor of Hawai‘i Institute of Geophysics and Planetology at and at the the University of Hawai‘i. He is also president of University of Arizona’s Lunar and Planetary the Meteoritical Society and an associate editor of Laboratory. He received a PhD in Earth and plan­ & Planetary Science. He enjoys studying etary sciences from Washington University in St. the mineralogy and geochemistry of diverse kinds Louis in 1997. He was the recipient of the 2002 of meteorites to understand how they formed on Nier Prize of the Meteoritical Society and the 1995 diverse parent bodies. Ed says he is very fortunate Nininger Award. His research interests to live in paradise, study incredibly fascinating meteorites with very center on the chemistry and mineralogy of asteroids and comets as able colleagues in Hawai’i and elsewhere, and teach planetary geology determined by in situ laboratory analysis and spacecraft observations. to students. He is also working to develop an sample-return mission to Anat Shahar received her PhD in geochemistry bring back pristine samples from a carbonaceous near-Earth object. from the University of California, Los Angeles, in Zita Martins received her PhD in 2008. Her research deals with stable isotope frac­ from in the Netherlands in 2007. tionation at high pressure and temperature in She has published several papers on the organic order to understand more about the conditions and chemistry of carbonaceous . She has also processes occurring during the formation of the worked on the organic analytical instruments for Solar System. She is currently a staff scientist at the ExoMars mission. She is currently a postdoc­ the Geophysical Laboratory of the Carnegie toral researcher at Imperial College, London. Institution of Washington. Edward D. Young is a professor of isotope geo­ Scott Messenger is a space scientist whose exper­ chemistry in the Department of Earth and Space tise is in the isotopic analysis of extraterrestrial Sciences at the University of California, Los materials by secondary ion mass spectrometry. He Angeles. His current research interests include received a bachelor’s degree in physics and early Solar System rock-forming processes and ter­ astronomy at the University of Washington (1991) restrial planet formation, asteroid hydrology and a PhD in physics at Washington University in through studies of meteorites, the development of Saint Louis (1997). His research has focused on new laser ablation techniques for measuring light- understanding the nature and origins of inter­ element isotope ratios in rock materials, isotope fractionation processes stellar grains and molecular cloud materials by means of coordinated in terrestrial and extraterrestrial systems, and the thermodynamics and evolution of metamorphic rocks.

Elements 8 February 2011