• CUNY Graduate Center (19 March 2010)
  
• DePaul University:
                                          9 April 2009
                                          12 March 2009
                                          10 October 2007
                                          8 November 2006
                                          4 November 2005
                                          21 October 2005
  
• Southern Illinois University (8 April 2005)
  
• Michigan State University (28 January 2004)
  
• University of Texas at Austin (10 October 2002)
  
• University of Illinois at Urbana-Champaign (18 May 2002)
  
• University of Colorado at Boulder (27 November 2001)
  
  

       Math Club Talks

• About a circle and beyond
• Some remarks about Cauchy's inequality
• About a problem from number theory
• Teachers' mistakes as a teaching tool
• The puzzling beauty of numbers
• A mathematical problem: easy or difficult?