Richard Ehrenborg


Department of Mathematics
University of Kentucky
Lexington, KY 40506-0027

Phone: + 1 (859) 257-4090
Fax: + 1 (859) 257-4078

Here is my current vita.

The Double Möbius strip and cutting it into two.

Here is an article at the College of Arts & Science about a Mathmagic talk I gave to the math majors. See also the two Vimeo links one and two. It also appeared at UKNow.

Here is the first part of my lecture "The Mathematics of Juggling" given April 8, 2009, during Geek Week 2009 at the University of Kentucky, together with my fearless graduate student Eric Clark. The five parts can be found here.

On April 7, 2010, Eric Clark and I gave the juggling lecture again. See the article Juggling the Equation in the The Kentucky Kernel. Note however that Katie Hume estimated the size of the audience to be 120.

Upcoming Invitations, Conferences and Workshops


Colloquium talk at Université Lyon 1 (April 2018).


All math meeting, University of Kentucky. (February 2016).

Colloquium at University of Maine. (March 2016).

Invited speaker at Marshall University to give two lectures. See the news story. (October 2016).


Invited speaker for The Mathematics of Michelle Wachs Conference, University of Miami (January 2015).

Speaker at Princeton University's Combinatorics Seminar. (February 2015).}

Speaker at Princeton University's Math Club, for the Pi-Day celebration (The Friday before Pi-Day 2015).

Speaker at Rutgers University Discrete Math seminar (April 2015).}

Speaker at the The 2015 Midwest Combinatorics Conference , University of Minnesota (May 2015).

Speaker at the AMS Special Session on Topological Combinatorics, Memphis, TN (October 2015).


Speaker at the AMS Special Session on Geometric and Algebraic Combinatorics, Knoxville, TN (March 2014).

Colloquium at University of North Carolina Charlotte. (October 2014).

Speaker at the Triangle Lectures in Combinatorics, High Point University, North Carolina (October 2014).

Speaker at the Clemson Mini-Conference, Clemson University, South Carolina (October 2014).

Speaker at the University of Pennsylvania combinatorics seminar (November 2014).

Speaker at Institute for Advanced Study (December 2014).


Speaker at Women and Mathematics Program, Institute for Advanced Study (May 2013).

Speaker at NORCOM 2013, Royal Institute of Technology, Sweden, (June 2013).

Speaker at FPSAC 2013, Paris, France, (June 2013).

Keynote speaker at CGames 2013, that is, 18th International Conference on Computer Games, Louisville, (August 2013).

Speaker at the AMS Special Session on Topological Combinatorics, St. Louis, MO (October 2013).


Speaker at the AMS Special Session on Combinatorial Geometry of Polytopes at the Joint Mathematics Meetings in Boston (January 2012).

Seminar at George Washington University. (March 2012).

Research visit to Institute for Advanced Study, Princeton. (May 2012)

Research visit, colloquium talk and seminar talk at the University of Strathclyde Combinatorics Group, Glasgow (May 2012).

Research visit and talk in the MIT Combinatorics Seminar at MIT (October 2012).


Invited speaker at Rutgers Experimental Mathematics Seminar (February 2011).

Invited to LaCIM (March 2011).

Invited speaker at FPSAC 2011, (June 2011).

Workshop on Symmetry in Graphs, Maps and Polytopes at The Fields Institute (October 2011).


Speaker at the AMS Special Session on Permutations at the Joint Mathematics Meetings in San Francisco (January 2010).

Invited speaker at Southwestern Undergraduate Mathematics Research Conference. (March 2010). See the picture in the Fall 2010 Maxima Newsletter.

Organizer of the Workshop CATS 2010: Combinatorics 2010: Advances, Trends and Speculations. Funded by NSF grant DMS-1024407. The keynote speakers are Sara Billey (U Washington), Patricia Hersh (North Carolina State), Isabella Novik (U Washington) and Stephanie van Willigenburg (U British Columbia). March 26, 2010.

Organizer of the AMS Special Session Advances in Algebraic & Geometric Combinatorics. March 27--28, 2010.

Speaker at 2010 SIAM Conference on Discrete Mathematics.

Member at The Institute for Advanced Study (September 2010 to July 2011).

Invited to participate in the Quasisymmetric Functions Workshop at Banff International Research Station (November 2010).

2006, 2007 2008 and 2009.


I have had the pleasure and honor to work with the following people: Margaret Bayer, Matthias Beck, Louis Billera, Miklós Bóna, Benjamin Braun, Jason I. Brown, Yue Cai, Denis Chebikin, Eric Clark, Danielle Cox, Yossi Farjoun, Bradley Fox, Harold Fox, Mark Goresky, Likith Govindaiah, Masahiro Hachimori, Alex Happ, Dustin Hedmark, Cyrus Hettle, Gábor Hetyei, Dan Johnston, Kalle Karu, JiYoon Jung, Sergey Kitaev, Carly Klivans, Menachem Lazar, Michael Levin, Swapneel Mahajan, Jeremy Mason, Miguel Méndez, Peter S. Park, Peter Perry, Pavlo Pylyavskyy, Rajmohan Rajagopalan, Margaret Readdy, Nathan Reading, Gian-Carlo Rota, Chris Skinner, Michael Slone, Einar Steingrímsson and Stephanie van Willigenburg.

See also at my listing at MathSciNet.

Coorganizer of first Julia Robinson Math Festival in Kentucky, 2017 and 2018.

Margaret Readdy and I are the founders and organizers of the Math Movie of the Month.

I also help out at the Henry Clay High School Math Club.

Michael Levin received Honorable Mention for the Morgan Prize for his work in the paper, "A probabilistic approach to the descent statistic." pdf

Here is a page with links to departments and institutes where I have worked or visited.

Here is a collection of math related links.

Here is a family tree of mathematical descendents of Gian-Carlo Rota.

Finally, my coauthors are from the following countries: