Dr. Katie Bouman developed an algorithm known as Continuous High-resolution Image Reconstruction using Patch priors (or CHIRP) which allowed for the first-ever picture of a supermassive black hole to be rendered —
Event Horizon Telescope - Wikipedia
Event Horizon Telescope Reveals Turbulent Black Hole Evolution: Wobbling Shadow of the M87 Black Hole
Event Horizon Telescope - Wikiwand
Event Horizon Telescope
Here's What the First Images from the Event Horizon Might Look Like - Universe Today
Montage of the Event Horizon Telescope observatories (night) | ESO