Tony Sohn

Support Scientist
Tony Sohn headshot

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 with a focus on using Hubble for studies of the dynamics of galaxies in the Local Group. He specializes in measuring proper motions of galaxies, star clusters, stellar streams, and individual stars located throughout the Local Group applying state-of-the-art image processing techniques to multi-epoch data obtained with space-based telescopes. Dr. Sohn's work on the first measurement of M31 proper motion gained wide international news coverage. He has been the Principal Investigator of many Hubble programs throughout his career and has published over 50 papers on related topics. Dr. Sohn's current scientific interests are in improving our dynamical understanding of the M31 system through proper motions measurements of stars in the M31 halo and disk (HST GO-15658), M31 satellite dwarf galaxies (HST GO-16273), and M33 (HST GO-16274).


PhD in Astronomy, University of Virginia
MS in Astronomy, University of Virginia
BA in Astronomy, Yonsei University, Seoul, Korea


Research Topics: Star Formation, Histories, and Evolution, Local Group Galaxies, Galaxy Formation and Evolution, Stellar Populations, Resolved Stella Populations


Professional Websites:

Professional Website


ORCID ID: 0000-0001-8368-0221


To contact one of our research staff members
please call 410-338-4700 or view the index for their email alias