I am a staff scientist in the
Department of Terrestrial Magnetism of the Carnegie Institution of Washington.
My primary research interests are in the laboratory analysis and scientific implications of extraterrestrial materials, including meteorites and interplanetary
dust particles. I am very interested in presolar grains in meteorites and in the development of new techniques for isotopic analysis and mapping of
small samples. I am actively involved in the analysis of cometary samples returned by NASA's STARDUST mission and solar
wind samples returned by the GENESIS mission.
I also work on X-ray and Gamma-ray spectrometers for planetary missions. I am Deputy Principal Invesigator on the
Science Team for
the MESSENGER mission, which orbited the planet Mercury from 2011-2015. I am also a member of the X-ray spectrometer team for the ESA/JAXA Mercury mission, BepiColombo, to be launched in November 2018. and I a NASA Participating Scientist on JAXA's Hayabusa2 asteroid sample return mission.