- Configurations of embedded spheres, University of Wisconsin, Madison, November 2015.
- Index theory for end-periodic operators, PIMS Symposium on the Geometry and Topology of Manifolds, Vancouver, June 2015.
- Absolutely exotic 4-manifolds Canadian Mathematical Society Winter Meeting, Hamilton, Ontario, December 2014.
- Embeddings of non-orientable surfaces Workshop on Geometry and Topology of smooth 4-manifolds, Max Planck Institute, Bonn, June 2013.
- An index theorem for end-periodic operators, University of Minnesota, November 2011.
- Applications of Heegaard-Floer theory to link concordance, University of Paris, March 2011.
- Periodic-end Dirac operators and Seiberg-Witten theory, Duke University, December 2009.
- Slice knots and the Alexander polynomial, Wesleyan University, November 2009.
- Slice knots and the Alexander polynomial, Miami University, November 2009.
- Rohlin’s invariant and periodic-end Dirac operators, Conference on Spectral Geometry, Potsdam, May 2008.
- Periodic-end Dirac Operators and Positive Scalar Curvature, Texas Geometry & Topology Conference, Rice University, October 2006.
- Rohlin's Invariant and 4-dimensional Gauge Theory, AMS Special Section, Bloomington, April 2003.
- Applications of 1-parameter gauge theory, Dartmouth Colloquium, March 2004.
- Rohlin’s Invariant and 4-dimensional Gauge Theory, Geometry and Topology of Manifolds, Fields Institute, Hamilton, May 2004.
- Isotopy of 4-manifolds and the Seiberg-Witten equations, AMS Special Session, Charlotte, October 1999.
##### Last updated: June 3, 2016

Here are a few files with slides from talks I've given over the last few years.