Research Interest

 Algebraic and Geometric Combinatorics
subspace arrangements, polytopes, matroids, oriented matroids, Bruhat order
 Combinatorial commutative algebra
Stanley-Reisner rings, cellular resolutions

Education/Employment

 Postdoctoral Assistant Professor, Department of Mathematical Sciences, George Mason University, 2007 - present
 Ph. D. in Mathematics, School of Mathematics, University of Minnesota, 2007. 
Thesis title: Topology of diagonal arrangements and flag enumerations of matroid base polytopes
Thesis Advisor : Prof. Victor Reiner
 M.S. in Mathematics, Department of Mathematics, Yonsei University, Seoul, Korea, 1999
Thesis Advisor : Prof. SeungKyoung Park
  B.S. in Mathematics, Department of Mathematics, Yonsei University, Seoul, Korea, 1995

Talks

  Topology of real arrangements corresponding to shellable complexes
AMS Special Session, Arrangements and related topics, Baton Rouge, LA, Mar. 2008
  Flag enumerations of matroid base polytopes
Formal Power Series and Algebraic Combinatorics '08, Valparaiso, Chile, Jun. 2008
Algebra-Geometry-Combinatorics Seminar, San Francisco State University, Mar. 2008
Combinatorics, Algebra, and Geometry Seminar, George Mason University, Sep. 2007
  Shellable complexes and topology of diagonal arrangements 
Colloquium, Ajou University, Korea, Jul. 2008
Combinatorics, Algebra, and Geometry Seminar, George Mason University, Sep. 2007
Formal Power Series and Algebraic Combinatorics '06, San Diego, CA, Jun. 2006
Combinatorics Seminar, Univ. of Minnesota, Sep. 2005
 Discrete Morse theory
Student Combinatorics Seminar, Univ. of Minnesota, Feb. 2005
 Schlegel diagrams for polytopes
Student Combinatorics Seminar, Univ. of Minnesota, Apr. 2004

Publications

  Shellable complexes and topology of diagonal arrangements,
Discrete & Computational Geometry 40 (2008), no. 2, 190 - 213
 Flag enumerations of matroid polytopes, to appear
Journal of Combinatorial Theory, Series A
 Topology of real coordinate arrangements, in preparation
 Topology of diagonal arrangements and flag enumerations of matroid base polytopes,
Ph. D. Thesis, University of Minnesota

Research Experience

 Participant in ACE Summer School on Geometric Combinatorics, Vienna, Austria, Jul. 2005
 Visiting Graduate Student at Philipps-Universitat Marburg, Germany, May - Aug. 2005
 Co-organizer for Graduate Student Combinatorics Conference, Minneapolis, MN, Apr. 2005
 Participant in PCMI/IAS Summer School on Geometric Combinatorics, Park City, UT, Jul. 2004
 Participant in MSRI Summer School on Triangulations of Point Sets, Berkeley, CA, Jul. 2003