Lectures and Unpublished Articles

• Lecture at the Fifth European Congress of Mathematics (Amsterdam, 7/2008)
• Kolchin Lecture (Columbia, 2008) 1-15, 16-22.
• British Topology Meeting (Sheffield, 9/2007)
  
• Adem Lectures (Mexico City, 9/2006)
  
• The Structure of 2D Semi-Simple Field Theories
  (Lecture at: Mathematical Structures in String Theory, KITP, Santa Barbara, 2005)
• Loop Groups and Moduli of G-bundles on curves
  (DRAFT notes based on Lecture in Seattle, July 2005)
• On Semi-simple TFTs and Gromov-Witten theory of BG:
  Gregynog 10/04, Goettingen 11/04, Miami 12/04
  
• Higher twistings of K-theory and moduli spaces
  (Lecture at: Geometry, Topology and Strings, KITP Santa Barbara, 2003)
• De Rham's theorem for stacks (with C. Simpson).
  Caution: §4 and §5 are unfinished and may forever remain so.