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.

November 2021: Nothing Up His Sleeve: Mathematician Creates Card Trick to Illustrate Key Concepts in Information Correction.

February 2017: The Double Möbius Strip and cutting it into two.

May 2016: 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


Rutgers Experimental Mathematics Seminar (March 2022).


Seminar talk at University of North Carolina at Charlotte (February 2021).


Princeton University (May 2019).

Helen Barton Lecture, University of North Carolina at Greensboro (November 2019).


Colloquium talk at Université Lyon 1 (April 2018).

2006, 2007, 2008, 2009. 2010, 2011, 2012, 2013. 2014, 2015, 2016 and 2017.



I have had the pleasure and honor to work with the following people: Margaret Bayer, Matthias Beck, Frits Beukers, Louis Billera, Miklós Bóna, Benjamin Braun, Jason I. Brown, Yue Cai, Karthik Chandrasekhar, 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, JiYoon Jung, Kalle Karu, Sergey Kitaev, Carly Klivans, Menachem Lazar, Michael Levin, Swapneel Mahajan, Jeremy Mason, Miguel Méndez, Sophie Morel, 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.

Margaret Readdy and I held the 2019 Julia Robinson Math Festival at the Central Public Library in Lexington (November 2019). See pictures.

We coorganizer the first and second 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: