Featured speakers are highlighted here. Click on each image to see more details and access audio clips of the lectures.
February 3, 1961
May 3, 1967
November 12, 1969
October 6, 1976
March 5, 1980
February 18, 1981
March 25, 1981
April 1, 1981
October 15, 1986
April 18, 1990
October 24, 1990 & November 29, 2000
January 18, 1995
October 11, 2000
November 1, 2000
March 27, 2002