Professor, School of Mathematics, Korea Institute for Advanced Study (KIAS)
Adjunct Professor, Department of Mathematical Sciences, KAIST
Research interest geometric group theory and low-dimensional topology:
hyperbolic group, mapping class group, right-angled Artin group, diffeomorphism group, acute triangulations
Rigidity and Regularity of Diffeomorphism Groups (RRDG 2020), KIAS, Seoul, Korea, postponed to a later year.
(With Thomas Koberda) Diffeomorphism groups of critical regularity.
Inventiones mathematicae , 221(2), 421-501 (2020).
(With Thomas Koberda and Yash Lodha), Chain groups of homeomorphisms of the interval and the circle.
Annales Scientifiques de l'École Normale Supérieure, Series (2019)
(With Hyungryul Baik and Thomas Koberda), Unsmoothable group actions on compact one-manifolds.
Journal of European Mathematical Society (2019)
(With Genevieve Walsh), Coxeter groups, hyperbolic cubes, and acute triangulations.
Journal of Topology (2016)
(With Thomas Koberda), Embedability between right-angled Artin groups.
Geometry & Topology (2013)
Scientist and Engineer of the Month, 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), Feb 26, 2018 - present.
Research Excellence Award, College of Natural Sciences, Seoul National University, March 3, 2017.
Excellent Paper Award, 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, College of Natural Sciences, Seoul National University, September 15, 2015.
An 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.
Excellence Prize, College Mathematics Competition, Korean Mathematical Society, 1994 and 1995.
Silver medal, the 34th International Mathematical Olympiad, Turkey, 1993.