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An isolated horizon (IH) is a null hypersurface at which the geometry is heldfixed. This generalizes the notion of an event horizon so that the black holeis an object that is in local equilibrium with its (possibly) dynamicenvironment. The first law of IH mechanics that arises from the frameworkrelates quantities that are all defined at the horizon.  IHs have been extensively studied in Einstein gravity with various mattercouplings and rotation, and in asymptotically flat and asymptotically anti-deSitter (ADS) spacetimes in all dimensions $D\geq3$. Motivated by thenonuniqueness of black holes in higher dimensions and by the black-hole/stringcorrespondence principle, we devote this thesis to the extension of theframework to include IHs in string-inspired gravity models, specifically toEinstein-Maxwell-Chern-Simons (EMCS) theory and to Einstein-Gauss-Bonnet (EGB)theory in higher dimensions.  The focus is on determining the generic features of black holes that aresolutions to the field equations of the theories under consideration. We obtainvarious results for non-extremal, extremal and supersymmetric IHs in EM-CStheory, and for non-rotating IHs in EGB theory.  (An extended abstract is given in the PDF file.)

Extending the isolated horizon phase space to string-inspired gravity models