Einstein Metrics, Minimizing Sequences, and
the Differential Topology of Four-Manifolds.
International Conference on Differential Geometry,
Münster, Germany,
August 15, 2006.

Optimal Metrics, Curvature Functionals, and
the Differential Topology of Four-Manifolds.
Geometry Conference in Honor of Nigel Hitchin,
Madrid, Spain,
September 5, 2006.

On Conformally Kähler, Einstein Manifolds.
Einstein Manifolds and Beyond:
Variétés d'Einstein aujourd'hui et demain,
Luminy, France.
June 21, 2007.

Einstein Metrics and Global
Conformal Geometry, I & II.
NZIMA Summer School,
Nelson, New Zealand.
January 8 & 10, 2008.

On Four-Dimensional
Einstein Manifolds.
7th Conference on Geometry and Topology,
Harvard University, Cambridge, MA,
May 3, 2008.

On Four-Dimensional Optimal Metrics.
Conformal Geometry:
Invariant Theory and Variational Methods,
Roscoff, France,
June 30, 2008.

The Einstein-Weyl Equations,
Scattering Maps, and Holomorphic Disks.
Geometry of Einstein Metrics,
Nantes, France,
June 29, 2009.

Einstein Manifolds and Extremal Kähler Metrics.
Fifth Yamabe Memorial Symposium:
"Geometry and Low-Dimensional Topology,"
University of Minnesota,
Minneapolis, MN, October 8, 2010.

On Hermitian, Einstein 4-Manifolds.
26th Annual Geometry Festival,
University of Pennsylvania,
Philadelphia, PA,
April 16, 2011.

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