Speaker at the AMS Special Session on Combinatorial Geometry of Polytopes at the Joint Mathematics Meetings in Boston (January 2012).

Seminar at George Washington University. (March 2012).

Research visit to Institute for Advanced Study, Princeton. (May 2012)

Research visit, colloquium talk and seminar talk at the University of Strathclyde Combinatorics Group, Glasgow (May 2012).

Research visit and talk in the MIT Combinatorics Seminar at MIT (October 2012).

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