Selected talks

• U. of Minnesota, September 2002
• U of L'Aquila, Italy, July 2002.
• U of Trieste, Italy, July 2002.
• Yale University, February 2001
  
• Wayne State Univ., January, 2001
• Univ. of Minnesota, November 2001
  

• University of Illinoys at Chicago, October 2000.

• University of Minnesota, November 2000
• University of Michigan}, December 2000.
• Univerity of Oslo March 2000.
• University of L'Aquila, December 1999. 
• University of  Ferrara, September 1999.
• University of Milano, July 1999.
• Yale University, January 1999.
• University of Siena, June 1998.
• Max Planck Institute, Germany, April 1998.
• University of Muenster. Germany, April 1998.
• University of Beyrouth. Germany, November 1997.
• The Mittag-Leffler Institute, Sweden, November 1996. 
• University of Erlangen, Germany, December 1995.
• A.M.S. Summer Res. Inst. in Algebraic Geometry, July 1995.

• M.S.R.I, Berkeley, May 1993.