  In this talk, we summarize our recent proposal for lowering the scale of
grand unification to the TeV range though the appearance of extra spacetime
dimensions. Particular emphasis is placed on the perturbativity and
predictivity of our scenario, as well as its sensitivity to unification-scale
effects.
  (Proceedings of invited talks given by KRD at PASCOS '98; by TG at the
European Network Meeting ``From the Planck Scale to the Electroweak Scale'';
and by KRD and TG at SUSY '98.)
