Professor, Korea Institute for Advanced Study, 2019 - present.
Adjunct Professor (joint appointment), Department of Mathematical Sciences, KAIST , 2019 - present.
Seoul National University (Associate Professor), 2014 - 2018.
KAIST (Assistant, Associate Professor), 2011 - 2014.
Tufts University (Norbert Wiener Assistant Professor), 2010 - 2011.
the University of Texas at Austin (R. H. Bing Instructor), 2008 - 2010.
Mathematical Sciences Research Institute, 2007.
Editor, Journal of Korean Mathematical Society (2019 - )
Steering Committee, AI Center for Basic Sciences, KIAS, 2020 - .
Research Output Analysis Committee (성과분석위원), National Research Foundation of Korea (한국연구재단), 2020 - .
Review Board (전문위원, 분야별 지원체계 자문위원회), National Research Foundation of Korea (한국연구재단), 2018 - 2021.
Steering Committee, Seoul Science High School (2018.3 - 2020.2)
Executive board member, Korean Mathematical Society (2013 - 2014 )
Member, Korean Mathematical Olympiad (KMO) Committee (2013 - )
Organizing Committee, Rigidity and Regularity of Diffeomorphism Groups (RRDG 2020), KIAS, Seoul, Korea, Aug 3 - 7, 2020: postponed.
Program Committee, The 15th East Asian School of Geometric Topology, RIMS & Kyoto University, Japan, Feb 10 - 13, 2020. (annual)
Organizing / Scientific Committee, One-dimensional actions of 3-manifold groups, Dijon, France, November 4 - 8, 2019.
Organizing Committee, Combinatorial and algebraic aspects of geometric structures, Chiang Mai University, Thailand, July 18 - 26, 2019.
Scientific Committee, yGGT-2019, Bilbao, Spain, June 30 - July 5, 2019.
Scientific Committee / Organizer, GAGTA-2018, Seoul, Korea (2018)
Scientific Committee, Workshop on Groups, Geometry and Dynamical System (ICM 2018 satellite), Montevideo, Uruguay (2018)
Organizer, IBS Undergraduate Mathematics Festival, 2015.
Organizer, East Asian Conference on Algebraic Topology 6 (EACAT-6), Daejeon, Korea, 2015.
Organizer, Geometric Group Theory Workshop, Seaes Hotel, Jeju Island, Korea Dates January 22 - 24, 2015.
Seoul National University
Algebraic Structure of Diffeomorphism Groups (graduaute course), Spring 2018. Dynamics on the Circle (graduate course), Spring 2016.
Geometry on Infinite Groups (graduate course), Fall 2014.
Mathematics and recitation 1, 2 (non-math majors Calculus), Spring and Fall 2014. Calculus 1 and 2 (math majors), Spring and Fall 2015, 2018.
Topology 1, 2 (undergraduate), Spring and Fall 2015. Mathematics for Biology 1, 2, Spring and Fall 2016. Algebraic Topology 1, Fall 2016, 2018.
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Education 3.0 Calculus I, Spring 2012, Spring 2013 – a discovery oriented course with bottom-up approach and multimedia integration.
Education 3.0 Calculus II, Fall 2012.
Algebraic Topology I (graduate course), Spring 2013.
Groups, Graphs and Geometry (graduate course), Spring 2012. Calculus II (Calculus of Several Variables), Fall 2011. Freshman Seminar, Fall 2011.
Calculus II, Fall 2010.
Calculus III, Fall 2010 and Spring 2011.
the University of Texas at Austin
Differential and Integral Calculus I, Spring 2008, Fall 2008 and Fall 2009. Differential and Integral Calculus II, Spring 2010.
Introduction to Number Theory, Summer 2009.
Probability I, Summer 2008 and Spring 2009.
Discrete Mathematics, Spring 2008.
Topics in Geometric Group Theory (graduate course), Spring 2010.
Calculus of Functions of One Variable, 2006 and 2007.
Introduction to Functions of Several Variables, 2006.
Calculus of Functions of Several Variables, 2001, 2002, 2003, 2004, 2005 and 2006.