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).

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