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