  We present a framework for grand unification in which the grand unified
symmetry is broken spontaneously by strong gauge dynamics, and yet the physics
at the unification scale is described by (weakly coupled) effective field
theory. These theories are formulated, through the gauge/gravity
correspondence, in truncated 5D warped spacetime with the UV and IR branes
setting the Planck and unification scales, respectively. In most of these
theories, the Higgs doublets arise as composite states of strong gauge
dynamics, corresponding to degrees of freedom localized to the IR brane, and
the observed hierarchies of quark and lepton masses and mixings are explained
by the wavefunction profiles of these fields in the extra dimension. We present
several realistic models in this framework. We focus on one in which the
doublet-triplet splitting of the Higgs fields is realized within the dynamical
sector by the pseudo-Goldstone mechanism, with the associated global symmetry
corresponding to a bulk gauge symmetry in the 5D theory. Alternatively, the
light Higgs doublets can arise as a result of dynamics on the IR brane, without
being accompanied by their triplet partners. Gauge coupling unification and
proton decay can be studied in these models using higher dimensional effective
field theory. The framework also sets a stage for further studies of, e.g.,
proton decay, fermion masses, and supersymmetry breaking.
