It has recently been demonstrated that black hole dynamics can be reformulated as the equations of motion of a codimension one membrane (roughly the black hole event horizon). These membrane equations have previously been determined at leading order in the large D expansion. In this talk we implement this `duality' to next order in 1/D and thereby determine the leading corrections to the membrane equations of motion. Our results obey several consistency checks; in particular upon linearizing our equations about a spherical membrane we reproduce the known quasinormal mode frequencies of large D Schwarschild black holes, including first subleading corrections in 1/D.

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