Harry investigates the role Active galactic nuclei (AGN) may play in producing mergers between black holes and other compact objects after capturing them into its accretion disk. Interactions with the disk gas may produce electromagnetic counterparts to the mergers that must be distinguished from supernova light curves emitted during the deaths of massive stars also captured by the disk, or formed within it. 

To do so, he conducts simulations of supernovae in disks using the Athena magnetohydrodynamics code in order to first understand the trapped feedback on disk structure. Then, he post-processes with the Ocotillo multi-wavelength radiative transfer code to produce light curves.