  The nonlinear $\sigma$-model for disordered interacting electrons is studied
in spatial dimensions $d>4$. The critical behavior at the metal-insulator
transition is determined exactly, and found to be that of a standard
Landau-Ginzburg-Wilson $\phi^4$-theory with the single-particle density of
states as the order parameter. All static exponents have their mean-field
values, and the dynamical exponent $z=3$. $\partial n/ \partial \mu$ is
critical with an exponent of $1/2$, and the electrical conductivity vanishes
with an exponent $s=1$. The transition is qualitatively different from the one
found in the same model in a $2+\epsilon$ expansion.
