Research area: algebraic combinatorics.
Selected publications:

• (with I. Grojnowski and C. Teleman) ``The strong Macdonald conjecture and Hodge theory on the Loop Grassmannian,'' math.AG/0411355. To appear in Annals of Mathematics.
• ``Statistics for special Kostka polynomials,'' Proceedings of the American Mathematical Society, 123:10 (1995).
• (with I. Grojnowski) ``Canonical bases for the Brauer Centralizer algebra'' Mathematical Research Letters, 2:1 (1995), pp. 15-26.
• ``Nonnegativity results for generalized q-binomial coefficients,'' Discrete Mathematics, 147:1-3 (1995), pp. 121-137.