- Algebraic and geometric combinatorics, particularly the combinatorics of Coxeter groups and cluster algebras.
- Partially supported by NSF grant DMS-1101568.
- Triangle Lectures in Combinatorics, a twice-yearly research conference on combinatorics and related areas.
Partially supported by NSF grant DMS-1202691 and NSA grant H98230-12-1-0272.
- MA 524, Combinatorics I
- MA 796, Introduction to Coxeter groups