Dan Ullman's Homepage

Daniel Ullman

I am a professor in the Department of Mathematics at the George Washington University, Washington, DC.

I can be reached

in person at my office, Monroe Hall, room 273 (click here for times);
by telephone at (202) 994-6343;
by e-mail at dullman@gwu.edu;
by fax at (202) 994-6760; or
by snail mail at

The Department of Mathematics
The George Washington University
Washington, DC 20052

During the 2006--2007 academic year, I was on leave from GW and serving as the AMS/AAAS Congressional Fellow, working on Capitol Hill.

My research interests are in the area of graph theory and combinatorics, particularly in the chromatic theory of graphs, combinatorial game theory, and the theory of fractional graph invariants. In 1997, John Wiley and Sons published "Fractional Graph Theory", written jointly by me and Ed Scheinerman. Currently, I am working with Robbie Robinson on a book for liberal arts students on mathematics and politics.

In addition to my research and teaching, I have been the lead editor of the Problems Section of the American Mathematical Monthly for the term 1997--2001. I also was the DC Director of the 2001 International Mathematical Olympiad, which took place in Washington DC in July. These evidence my long-standing interest in problems and contests.

I am director of the DC Math Circle, an enrichment program for talented and motivated 8th grade students from the District of Columbia.

A recent interest is the in-service professional development of middle school and high school mathematics teachers.

My hobbies include playing piano (mostly Chopin and jazz), playing racquet sports (racquetball), playing Scrabble (I once got TRIOXIDE), singing (baritone), cooking (chocolate mousse), going to the theatre (Sondheim), soccer (player, fan, coach, and mom), gardening (not much time for this) and juggling (lacrosse balls). My favorite punchlines include "No, of course I don't believe in that stuff, but I hear it works even if you don't believe in it." and "Really? Come over to my house. I've got closets full of them." Another hobby is composing sentences that seem to be self-referential but actually aren't.