  An overview of unified theory models that extend the standard model is given.
A scenario describing the physics beyond the standard model is developed based
on a finite quantum field theory (FQFT) and the group G=$SO(3,1)\otimes
SU(3)\otimes SU(2)\otimes U(1)$. The field theory is Poincar\'e invariant,
gauge invariant, finite and unitary to all orders of perturbation theory and
has a fundamental scale which is chosen to be $\Lambda_F =1/\sqrt{G_F}\sim 300$
GeV, where $G_F$ is the Fermi coupling constant. The physical Higgs particle is
protected from acquiring a large mass beyond $\sim 1$ TeV, removing the gauge
hierarchy problem associated with the scalar Higgs field. This avoids the need
for a composite Higgs field or supersymmetry. The coupling constants and the
fermion masses can be calculated from a set of low-energy relativistic
eigenvalue equations based on truncated Green's functions and the FQFT,
reducing the number of free parameters in the model without a grand unification
scheme. The proton is predicted to be stable. Quantum gravity is perturbatively
finite and unitary to all orders.
