AGN accretion disks mapped with photons and gravitational waves.

The era of gravitational wave (GW) astronomy, and consequently, multi messenger astronomy (MMA), has arrived for neutron stars and stellar mass black holes. I will discuss what we have already learned about AGN through these early GW detections. Given that AGN are a source type discovered by traditional EM astronomy, the future of MMA studies for AGN has begun. Future GW observatories — including upgraded ground-based GW detectors and space-based GW detectors like LISA — will be able to tell us a great deal about AGN, including tight constraints on elusive quantities like their typical lifetimes. But, we will need specific coordinated EM capabilities to maximize our understanding of these intrinsically multi messenger sources — especially space-based X-ray & UV observatories. Finally, I will point out the substantial theoretical work that must be completed over the next decade in order to fully interpret the combined LISA signal.