  Regardless of their initial seed mass, any active galactic nuclei observed at
redshifts z > 6 must have grown by several orders of magnitude from their
seeds. In this chapter, we will discuss the physical processes and latest
research on black hole growth and associated feedback after seed formation.
Fueling is initially slowed down by radiative feedback from the black hole
itself and supernova explosions from nearby stars. Its growth however
accelerates once the host galaxy grows past a critical mass.
