All math meeting, University of Kentucky. (February 2016).

Colloquium at University of Maine. (March 2016).

Invited speaker at Marshall University to give two lectures. See the news story. (October 2016).

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