  While attempts to unify certain classes of AGN using orientation and
environmental effects have been successful, it is widely recognized that
intrinsic properties of the accreting black hole system also must play a role
in determining the appearance of such an object. In addition to mass and
accretion rate, the angular momentum (or spin) of the black hole can play a
crucial role in determining the power of a relativistic jet that is generated
by magnetohydrodynamic acceleration near the hole. In this paper a scenario is
presented, based on accretion theory and recent models of MHD jet production,
in which the primary (although not only) parameter differentiating between
radio loud and quiet objects is the black hole spin, and that determining
quasar vs. radio galaxy is the accretion rate. A surprising number of desirable
features result from these simple concepts and the accompanying equations. In
addition, there are several testable predictions that can determine whether
this grand unification scheme has further merit.
