Over 120 quasars at redshift 6 or above have now been reported, including the highest redshift quasar to date recently discovered by Banados et al at z~7.5. How did these objects attain such high masses early in the history of the universe? In my talk I’ll give an overview of the main pathways that have been proposed to explain their formation. A generally accepted scenario is the direct collapse of an atomically cooling halo which avoids certain issues such as Eddington limited accretion; I shall discuss how this process is simulated in my research using the Enzo AMR code. I will then examine how angular momentum of the accretion disk is transported outwards through efficient fragmentation and bar-instabilities as well as the insertion of a black hole particle to analyse the effect of radiative feedback on the surrounding gas.