Distinguished and Plenary Talks
- Asprey Distinguished Lecture Series, Vassar College, March 23, 2008.
- Toyota Technological Institute of Chicago Distinguished Lecture Series, March 6, 2008.
- UCLA Mathematics Department Distinguished Lecture Series, January 9,10,11 2008.
- Gibbs Lecture,
Joint AMS-MAA Meeting, San Diego January 6, 2008.
- Keynote lecture at FCRC, San Diego, CA June 13, 2007.
- KAM Mathematical Colloquim, Prague, Czech Republic, April 27, 2007.
- Distinguished Lecture Series, University of Haifa, February 27-March 1, 2007.
- Distinguished Lecture Series, University of Wisconsin, Madison,, October 18, 2006.
- Distinguished Lecture Series, University of Indiana Combinatorics Seminar, September 27-29, 2006.
- IEEE Conference on Computational Complexity, Prague, Czech Republic, July 16-20, 2006.
- Horizons of Truth Goedel Centenary 2006, University of Vienna, April 29, 2006.
- Radcliff Institute for Advanced Study Science Lecture Series, October 9, 2003.