Resolving the event horizon: Black holes in the era of the Event Horizon Telescope

In April, 2017, the full Event Horizon Telescope, a global millimeter-wavelength interferometer capable of resolving the horizons of nearby supermassive black holes, observed Sgr A* and M87 for the first time. This new capability promises to transform our understanding of black hole astrophysics and provide a window onto the structure of spacetime itself around astrophysical black holes. I will describe how past, current and future observations with the EHT present novel opportunities to probe the environment, nature and strong gravity of these objects.