Invited to participate in the Geometric Combinatorics Workshop at the Institute for Pure and Applied Mathematics, UCLA (October 2009).

Mathematical Magic. Talk to high school students at at the High School Mathematics Day (17 October 2009).

Colloquium at the George Washington University (20 April 2009).

Talk in the special session "Applications of Algebraic and Geometric Combinatorics" at the 2009 Spring Southeastern Sectional Meeting at North Carolina State (4 April 2009).

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