  We present an overview of a perturbative-kinetic approach to jet propagation,
energy loss, and momentum broadening in a high temperature quark-gluon plasma.
The leading-order kinetic equations describe the interactions between energetic
jet-particles and a non-abelian plasma, consisting of on-shell thermal
excitations and soft gluonic fields. These interactions include 2<->2
scatterings, collinear bremsstrahlung, and drag and momentum diffusion. We show
how the contribution from the soft gluonic fields can be factorized into a set
of Wilson line correlators on the light cone. We review recent
field-theoretical developments, rooted in the causal properties of these
correlators, which simplify the calculation of the appropriate Wilson lines in
thermal field theory. With these simplifications lattice measurements of
transverse momentum broadening have become possible, and the kinetic equations
describing parton transport have been extended to next-to-leading order in the
coupling g.
