Principal Staff Scientist
Space Telescope Science Institute (STScI)
Focal Plane Lead for JWST
I specialize in high-precision astrometry and photometry from space-based observatories including GALEX, Gaia, HST, and JWST. As a Principal Staff Scientist at STScI, I serve as the Focal Plane Lead for JWST, where I characterize telescope pointing and optical performance. I also lead pointing alignment and WCS infrastructure efforts for the upcoming Roman Space Telescope.
Pioneering proper motion measurements of M31 and Local Group dwarfs to constrain total mass and dynamical states. My work has provided the first direct proper motion measurement of M31 using HST, confirming its radial orbit toward the Milky Way.
Mapping 3-D kinematics of the M31 system to test galaxy assembly models. I am currently leading HST programs to measure internal kinematics of M31, the Giant Stellar Stream, and the rotation of satellite planes.
Using globular clusters, halo stars, and satellite galaxies as dynamical tracers to resolve uncertainties in the Milky Way's virial mass and dark matter halo structure.