G3 Geometric Group Theory Conference, Destin, Florida, November 11, 2004.
Noncommutative Geometry Conference, Oberwolfach, Germany, Sept. 12, 2004.
Geometric and Functional Analysis, Kyoto University, Japan, August 11-14, 2004.
Noncommutative Geometry in Mathematics and Physics, CIRM, Marseille, France, February 9-11, 2004.
BIRS Conference on the Novikov and Baum-Connes conjectures, Banff, Canada, June 4, 2003.
The 23rd Annual Great Plains Operator Theory Symposium, University of Illinois, Urbana-Champaign, May 29, 2003.
BIRS Conference on Noncommutative Geometry, Banff, Canada, April 6, 2003.
First Symposium of Japan Association for Mathematical Sciences, Tohuku University, Sendai, Japan, December 20, 2002.
Summer School on the Baum-Connes conjecture, Goettingen University, Germany, May 21-24, 2002.
Topology Festival, Cornell University, May 4, 2002.
Oberwolfach Conference on Noncommutative Geometry, Germany, March 26, 2002.
Wasatch Topology Conference, University of Utah, December 15, 2001.
Conference on Quantization and Noncommutative Geometry, Mathematical Sciences Research Institute, Berekely, California, April 24, 2001.
Southeastern Analysis Meeting, Athens, Georgia, March 2-3, 2001.
Topology Workshop, University of Chicago, November 14, 2000.
Symposium on Geometric Structures in Mathematics, June 30, 2000, Muenster, Germany.
Bounded Topology and Geometric Group Theory Conference, May 30, 2000, Muenster, Germany.
Noncommutative Geometry Conference, March 27, 2000, Mathematisches Forschungsintitut Oberwolfach, Germany.
Invited Address, American Mathematical Society Meeting, October 3, 1999, Providence, Rhode Island.
Cyclic Homology Symposium, Canadian Mathematical Society, December 8, 1996, London, Canada.
