  We compute the energy loss of heavy fermions moving in a plasma, taking into
account the modification of the photon collective modes induced by collisions
using a Bhatnagar-Gross-Krook collisional kernel. We include contributions from
both hard and soft scatterings of the heavy fermion using a collisionally
modified hard-thermal-loop resummed propagator. Using this method, one does not
need to introduce a separation scale between hard- and soft-momentum exchanges.
To place our calculation in context, we review other theoretical approaches to
computing the collisional energy loss of fermions and discuss the systematics
and results obtained in each approach compared to using a resummed propagator
for both hard and soft momentum exchanges. Our final results indicate that
self-consistently including the effect of collisions in the self-energies of
the resummed propagator results in an increased energy loss compared to using
collisionless hard-thermal-loop propagators. The effect becomes larger as the
magnitude of the coupling constant and the velocity of the fermion increase.
