Principal scientist in planetary astronomy at the Southwest Research Institute. Expert in the dynamics of binary minor planets, detection and characterization of trans-Neptunian objects, and the origin of the architecture of our Solar System.
Director of the NASA SSERVI node Project ESPRESSO and project lead for the Airborne Space Environment Chamber.
Principal Investigator of the Hubble Space Telescope Solar System Origins Legacy Survey.
Science team member on NASA's New Horizons mission to Pluto and Co-Investigator on New Horizons' extended mission to the Kuiper Belt Object 2014 MU69.