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I am a relativist by training. Very broadly, I am drawn to problems in gravity, geometrynonlinear dynamics, and astrophysics. My students and I currently work on black holes, gravitational waves, alternative theories of gravity, self-force and radiation reaction, nonlinear dynamics in relativistic astrophysics, geometric mechanics and geometric thermodynamics. When I'm lucky to have spare time, I indulge in some philosophy and history of science.

I lead the Gravity Group of the National Institute of Physics.

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