Johns Hopkins University
BS - Earth, Atmospheric, and Planetary Sciences,
Massachusetts Institute of Technology, 1991
PhD - Planetary Sciences, University of Arizona, 1997
I received my Ph.D. in Planetary Astronomy from the University of Arizona in 1997. At the Johns Hopkins University Applied Physics Laboratory, my research centers around near-infrared spectroscopy and spectrophotometry of asteroids. In particular, I'm interested in those asteroids that have evidence of water or organic materials in them, detectable in their infrared reflectance spectrum. This pursuit has led to studies of asteroids from 1996 FG3, a near-Earth asteroid on which clay minerals has been found, to 24 Themis, an asteroid in the outer belt on which his team found water ice -- a first for asteroids. I have particular interest in the dwarf planet Ceres, producing several papers in the past few years detailing its unusual composition and variation across its surface, as well a focus paper for the Planetary Science Decadal Survey. In addition to observational work, I have been active in the broader near-Earth object community, serving as a team member in several efforts to understand and report the impact hazard we face and how to lessen it, and leading a group reporting to NASA about the most important unknown factors related to human exploration of an asteroid.