Expository slides which survey the contents of Peter Teichner's Lecture notes on Slice Knots.
A talk on a 2nd order algebraic concordance group.
A talk on Casson-Gordon style obstructions to a 2-component link with linking number one being concordant to the Hopf link.
A talk on New Uses for the Alexander Invariant.
Casson towers and slice knots from Knots and Low dimensional manifolds in Busan, Korea.