Our studies of supermassive black holes span from their large scale environments to photons circling at the edge of the event horizon. The supermassive black hole group is a part of the Event Horizon Telescope Collaboration and the LISA Consortium, along with several international teams that coordinate multi-wavelength (and multi-messenger) programs to characterize these systems and probe fundamental questions including
* is general relativity valid in the strong-gravity regime?
* how are jets launched?
* what physics governs accretion flows near the event horizon?