Graphene, a one atom thick sheet of carbon, has a thermal conductivity (TC) of up to 5000 W/mK, 8 times that of copper. Moreover, when functionalized with oxygen, producing Graphene Oxide (GO), the TC can range from 5000 W/mK to as low as 2 W/mK, providing tremendous potential for tunability. While thermal properties of Graphene have been heavily studied using molecular dynamics (MD), thermal properties of GO are still largely unknown. For example, epoxy-functionalized GO buckles more severely than hydroxyl-functionalized GO, a mechanism that induces phonon scattering. Preliminary results show, for 5x5nm 20% GO, bulk TCs of 4 W/mK compared to 7 W/mK respectively. Furthermore, at these low TCs, non-equilibrium MD, normally subject to length effects, could be used to predict bulk values without extrapolation. For the previous hydroxylated GO sheets, a TC of 5.4 W/mK is measured, expected to quickly converge to bulk TC at larger sizes.