MIT Combinatorics Seminar (23 February 2007).

Visiting Cornell University mid-March 2007. Talk in the Cornell Discrete Geometry and Combinatorics Seminar (March 28, 2007).

Northeastern University's Geometry-Algebra-Singularities-Combinatorics Seminar (April 23, 2007).

Michigan State University's Algebra Seminar (October 26, 2007).

Michigan Undergraduate Mathematics and Midwest Systems Biology Conference (October 27, 2007).

Indiana University's Combinatorics Seminar (November 13, 2007).

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

jrge@ms.uky.edu