Professor of Mathematics
University of Pennsylvania
I am co-organizer
Elizabeth Beazley of Haverford College,
Linda Chen of Swarthmore College, and
Jennifer Morse of Drexel University) of the
Philadelphia Area Combinatorics and Algebraic Geometry (CAGE) Seminar
(Tuesdays from 2:30-3:30pm in DRL 4E9 at Penn and/or
Thursdays from 2:30-3:30pm in Korman Center 245 at Drexel).
CAGE Spring 2014
CAGE Fall 2013
On Saturday, May 3, 2014, the first annual
Mid-Atlantic Algebraic Geometry and Combinatorics (MAAGC)
workshop was held at Drexel University.
My research interests are in algebraic and enumerative
In particular, I work on problems involving symmetric functions and Macdonald polynomials,
combinatorial statistics and q-analogs,
rook polynomials, and am also interested in the zeros of polynomials and analytic functions.
I like experimental mathematics, and
often use computer algebra packages such as Maple in my research, to develop
and test conjectures.
Publications and Preprints,
The q,t-Catalan Numbers and the Space of Diagonal Harmonics
in pdf format
or ps format
The official bound version of this book can be ordered from the AMS. It is part of the
AMS University Lecture Series.
Transparencies from Selected Presentations
The (q,t)-Catalan Numbers and the Space of
Diagonal Harmonics, hour long Invited Address, AMS Sectional, Orlando Fl. Nov. 9, 2002.
A Combinatorial Model for the Macdonald Polynomials
(in pdf format), or postscript format, hour long
presentation at the
Workshop on Resolutions, Inverse Systems, and Coinvariants, University of Ottawa, Jan. 13, 2005.
Recent Combinatorial Results involving
Macdonald Polynomials and Diagonal Harmonics
(in postscript format), or
at the 18th International Conference on Formal Power Series and Algebraic Combinatorics
(FPSAC '06), San Diego, CA, June 22, 2006.
The Monotone Column Permanent Conjecture and Multivariate Eulerian Polynomials
, hour long
presentation at the 26th
Clemson mini-Conference on Discrete Mathematics and Algorithms, Clemson University, Oct. 28, 2011.
The PhD Oral Exam in Combinatorics at Penn
PhD and Masters Students
Some Past Workshops
BIRS Workshop on Applications of Macdonald Polynomials, September 9-14, 2007
Oberwolfach Workshop on Combinatorial Representation Theory, March 22-27, 2010
BIRS Workshop on Quasisymmetric Functions, November 14-19, 2010
Upcoming Presentations and Conferences
MFO Workshop on Enumerative Combinatorics, Oberwolfach, Germany, March 2-8, 2014
BruceFest: Conference on Bijective and Algebraic Combinatorics in honor of Bruce Sagan's 60th birthday, University of Florida, Gainesville, March 24-25, 2014
FPSAC 2014: 26th International Conference on Formal Power Series and Algebraic Combinatorics, DePaul University, Chicago, IL, June 29-July 3, 2014
IMA Workshop on Geometric and Enumerative Combinatorics, University of Minnesota, Minneapolis, November 10-14, 2014
Conference in honor of Michelle Wachs, Miami, Florida, January 6-9, 2015.
Special Session on Algebraic Combinatorics and Representation Theory, AMS-EMS-SPM International Meeting 2015, Porto, Portugal, June 10-13, 2015.
York University Applied Algebra Seminar, Toronto, Canada, April 6, 2015.
FPSAC 2015: 27th International Conference on Formal Power Series and Algebraic Combinatorics, Daejon, South Korea, July 6-10, 2015
Journal of Combinatorics
Bulletin of Parana's Mathematical Society
Member of the AMS and MAA
Fellow of the AMS
Department of Mathematics
University of Pennsylvania
209 South 33rd St.
David Rittenhouse Laboratory
Philadelphia, PA 19104-6395