Recursion Theory of Ramsey's Theorem: Universita degli Studi di Siena, April 2006: Lecture 1 Lecture 2 Lecture 3 Lecture 4 Lecture 5 Lecture 6
Logic Colloquium, University of California, Berkeley, November 18, 2005:
AMS meeting (in honor of retirement of Manuel Leman), Storrs, October 28-29, 2006:
CIE 2007, Siena, June 19, 2007:
American Mathematical Society-New Zealand Mathematical Society Joint Meeting, December 2007: