  The most massive black holes at redshifts z = 6 were already over billion
solar masses. In this chapter, we discuss the formation and growth of the first
black holes in the Universe. The deaths of massive primordial stars provide
potential seeds of supermassive black holes. Theoretical models predict that
the seed black hole masses range from 10 to 100,000 solar masses. Their initial
fueling may be limited by feedback from its progenitor star, the black hole
itself, and nearby star formation. Once the halo and galaxy surpasses a
critical mass, black hole growth may accelerate as the central gravitational
potential deepens with strong ensuing star formation.
