I am an Associate Professor in the Mathematics Department at George Washington University. I received my Ph.D. at MIT in 2012 under the guidance of Alex Postnikov and worked for several years as a post-doc in the combinatorics group at the University of Minnesota before coming to GW in 2017. My Erdős number (see also) is at most 3.

Contact Info

E-mail:
jblewis if-you're-not-a-computer-you-know-what-goes-here gwu.edu.

Address:
Phillips Hall, Room 707
801 22nd Street, NW
Washington, DC 20052 USA

Office phone:
(202) 994-0334

Research

I'm interested in combinatorics, especially enumerative and algebraic. Much of my recent work involves the combinatorics of permutations, reflection groups, and GL_n(F_q)-analogues. List of my papers, collaborators, and papers by my students are available here. Since 2025, I am an editor at the journal Combinatorial Theory.

Teaching

In Fall 2025, I am teaching Math 2185 (Comprehensive Intro to Linear Algebra) and Math 6630 (Topics in Combinatorics: Permutations). Students should look for all course materials on Blackboard.
A list of my past teaching is available here.

Office Hours

In Fall 2025, my office hours are W 2:15–3:15 and Th 1–3 (in my office).  If you are my student, you do not need to ask permission to come to office hours—just drop by!
If you would like to meet with me outside of office hours, please send me an e-mail, letting me know what times you are available.

Seminar

I co-organize the GWU combinatorics & algebra seminar with Sam Hopkins (Howard), Minh-Tâm Trinh (Howard), and Robert Won.