  I give a summary of my research with Prof. Dr. Reinhard Schlickeiser. It
mainly took place in the 1990s, when the Compton Gamma Ray Observatory was
giving a startling new view of the gamma-ray sky. Our work focused on particle
acceleration and radiation processes in the jets of active galactic nuclei
(AGN). We pioneered the external Compton scattering model of blazars, where
photons from outside the jet are intercepted and scattered to high energies by
the radio-emitting electrons within the jet. Although we originally focused on
external photons from the accretion disks of AGN, this process has been
extended to include a range of external photon sources, and is now established
as the primary source of gamma rays from flat spectrum radio quasars.

High Energy Astrophysical Phenomena