I work at Korea Institute for Advanced Study (KIAS) as Professor in the School of Mathematics since 2019. I also hold an adjunct professorship at KAIST. Before this, I worked at Seoul National University, KAIST, Tufts University, the University of Texas at Austin and MSRI. I received Ph.D in 2007 at Yale University under the supervision of Andrew Casson.
My research interests focus on the interplay between geometric group theory and low--dimensional topology, particularly motivated by right-angled Artin groups and manifold diffeomorphism groups. I was selected as the Scientist of the Month (July 2020) by the Korean Ministry of Science and ICT.
(With Thomas Koberda and Javier de la Nuez-Gonzalez) First order rigidity of homeomorphism groups of manifolds. [Link] [ArXiv]
(With Thomas Koberda) Diffeomorphism groups of critical regularity. Inventiones mathematicae (2020). [pdf] [journal page]
(With Thomas Koberda and Yash Lodha) Chain groups of homeomorphisms of the interval and the circle, Annales Scientifiques de l'École Normale Supérieure (2019) [Link]
(With Hyungryul Baik and Thomas Koberda) Unsmoothable group actions on compact one-manifolds, Journal of European Mathematical Society (2019) [Link]
(With Genevieve Walsh) Coxeter groups, hyperbolic cubes, and acute triangulations, Journal of Topology (2016) [Link]
(With Thomas Koberda) Embedability between right-angled Artin groups, Geometry & Topology (2013) [Link]
Daejeon, April 28, 2023. Talk at KMS Spring Meeting.
Tokyo, May 25 - 29, 2023. Talk at Gakushuin University.
Taipei, Jun 7 - 10, 2023. Talk at 2023 NCTS Workshop on Dynamical Systems.
Tokyo, Jul 12 - 16, 2023. Talk at The 14th MSJ-SI: New Aspects of Teichmüller theory.
Kyoto, Jul 16 - 18, 2023. Talk at Characters and Moduli of Surfaces (SerFest).
Vienna, Jul 19 - 21, 2023. Scientific Committee, GAGTA 2023.
Seoul, Aug 21 - 25, 2023. Talk / Organizing Committee, France--Korea Conference.
Conference organization in 2023 and later
Organizing Committee, France-Korea Conference on Algebraic Geometry, Number Theory, Topology, Probability Theory, and Partial Differential Equations, [Link]
Scientific Committee, Young Geometry Group Theory (YGGT) 2024, Bristol, UK.
Committee, Some one-dimensional workshop, some island, December 2023 (details TBA)
Organizing Committee, The 4th Korea-France Conference in Mathematics, KIAS, Seoul, Korea, August 21 - 25, 2023. [Link]
Scientific Committee, GAGTA2023 (Geometric and Asymptotic Group Theory with Applications), Vienna, Austria, July 17 - 21, 2023. (Note the date change!) [poster1] [poster2] [Link]
Organizing Committee, PK² Topology Workshop
Rigidity and Regularity of Diffeomorphism Groups (RRDG), KIAS, Seoul, Korea, postponed to a later year.
All in Korea Standard Time GMT+9
KIAS Geometry, Topology and Dynamics Seminar (Tuesdays 4 pm, occasional)
Virtual Seminar on Geometry and Topology (Wednesdays 4 pm, semi-weekly)
Group Actions Seminar (Thursdays 9 pm, semi-weekly. Halted)
Geometric Group Theory in East Asia (GGTEA) (Fridays 11 am, weekly)
Pradthana Jaipong (January 2023)
Thomas Koberda (May 2023)
Christian Rosendal (June 2023)
Alan Reid (August 2023)
The Scientist and Engineer of the Month (이달의과학기술인상), awarded by Korean Ministry of Science and ICT, and by National Research Foundation of Korea, July 2020.
Y-KAST Member (Young Korean Academy of Science and Technology, 한국차세대과학기술 한림원), Feb 26, 2018 - present.
Research Excellence Award (우수연구상), College of Natural Sciences, Seoul National University, March 3, 2017.
Excellent Paper Award (논문상), Korean Mathematical Society, April 23, 2016.For the work: (With Thomas Koberda), Embedability between right-angled Artin groups, Geometry & Topology 17 (2013) 493--530.
Teaching Excellence Award (우수강의상), College of Natural Sciences, Seoul National University, September 15, 2015.²An award first established in September 2015. Based on recommendations by students council, faculty committee and course survey.
Creative Teaching Grand Award, KAIST, February 15, 2013.
Sang-San Prize for Young Mathematicians, Korean Mathematical Society, October 5, 2012.
Silver medal, the 34th International Mathematical Olympiad, Turkey, 1993.