Distinguished and Plenary Talks
- Distinguished Lecture, University of Rochester, October 30, 2009
- Levi L. Conant Lecture, Worcester Polytechnic Institute, September 24, 2009.
- Sackler Distinguished Lectures in Mathematics, Tel Aviv University, March 9-13, 2009.
- Distinguished Lecture, Rutgers University, December 4, 2008.
- Distinguished Lecture Colloquium, PennState, November 19, 2008.
- 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 and 11, 2008.
- Gibbs Lecture,
Joint AMS-MAA Meeting, San Diego, January 6, 2008.
- CISE Distinguished Lecture at NSF, Washington, DC, September 27, 2007.
- 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.
- Louis Clark Vanuxem Lectures, Princeton University, February 13, 14 and 15, 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.