On June 23-27, 2003, I gave a series of 5 lectures at the Summer School and Workshop on Proof Theory, Computation and Complexity, at the Technical University of Dresden, Germany.

The topic of the lectures was: **Mass Problems**. My lecture notes
are available in several formats: DVI, PDF, PS.

A list of my recent and upcoming talks is available.

My publication list is available.

t20@psu.edu / 10 July 2003