Hyunseop (Joseph) Choi (he/him) is a postdoctoral researcher at Université de Montréal, specializing in multiwavelength observational studies of active galactic nuclei (AGN) feedback using world-class facilities like HST, JWST, Gemini, SDSS, and NOEMA.

He received his Ph.D. in Physics from the University of Oklahoma in 2022, where he conducted research projects on quasar outflows observed in broad absorption line (BAL) quasars and co-developed SimBAL, a spectral synthesis tool for modeling BAL quasars. His work led to the discovery of the most energetic outflow from a distant quasar.

His research focuses on the comprehensive analysis of black hole winds in quasar-mode feedback to understand their role in galaxy evolution. He is leading a follow-up investigation of a high-redshift BAL quasar using the JWST Cycle 3 program with NIRSpec-IFU to map the multi-phase interstellar medium of its host galaxy to study the impact and the role of quasar winds in feedback in the early Universe.

His work integrates state-of-the-art observations with advanced spectral analysis techniques using machine learning tools and photoionization modeling (Cloudy), aiming to quantify the energetics and physical properties of quasar-driven outflows across cosmic epochs. He is a primary contributor to the SimBAL project, a member of the Simons Collaboration project Learning the Universe, and an active co-investigator in the upcoming 4MOST spectroscopic survey program, the 4MOST–Gaia Purely Astrometric Quasar Survey.

He is also enthusiastic about promoting diversity, accessibility, and inclusion in the scientific community. He actively participates in outreach efforts to engage the public and mentors students to inspire the next generation of scientists.

For more information, see his publications.