Recent years have seen a dramatic increase in our understanding of planetary systems. Initially, new exoplanets were discovered through the effects they have on their parent stars whether through radial velocity, transits or microlensing methods but now the technology and the techniques have been developed to image light from exoplanets directly. Vast improvements have also been made in our ability to resolve circumstellar matter from protoplanetary disks, through transition disks to debris disks. These dramatic new observations have led to new advances in our theoretical understanding of the...