Earlier in his career, Dr. Sohn was a postdoctoral research associate at the Korea Astronomy & Space Science Institute in South Korea. He then worked at Caltech as a science team member of the GALEX project. In 2009, Dr. Sohn started working as a postdoctoral research associate at STScI, and then moved to Johns Hopkins University to work as a Associate Research Scientist. Since 2017, Dr. Sohn is working as an instrument scientist for Hubble's Space Telescope Imaging Spectrograph (STIS) carrying out calibration, troubleshooting, and user support.
Dr. Sohn has extensive observing experience on both ground- and space-based telescopes, with a focus on using Hubble for studies of the dynamics of galaxies in the Local Group. As the founding member of the High-resolution Space Telescope Proper Motion (HSTPROMO) collaboration, he specializes in measuring proper motions of galaxies, star clusters, stellar streams, and individual stars located throughout the Local Group using state-of-the-art image processing techniques. Dr. Sohn's work on the first proper motion of M31 in 2012 gained wide international news coverage. He has published about 50 papers on these and other topics, and he regularly referees papers for the Astronomical Journal, the Astrophysical Journal, and Astronomy & Astrophysics.
PhD in Astronomy, University of Virginia
MS in Astronomy, University of Virginia
BA in Astronomy, Yonsei University, Seoul, Korea
Research Topics: Local Group Galaxies; Galaxy Formation and Evolution; Stellar Populations; Star Clusters; Resolved Stellar Populations; Astrometry; Galactic Dynamics
ORCID ID: 0000-0001-8368-0221