  Poincare covariant quark models of the the nucleon, the $\Delta$ resonance
and their excitations are explored. The baryon states are represented by
eigenfunctions of the four-velocity and a confining mass operator, which
reproduces the empirical spectrum up to $\sim$ 1700 MeV to an accuracy of $\sim
6%$. Models of constituent quark currents provide the relations between
ground-state properties and transition amplitudes.
