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I will give a broad overview of the science questions that were motivating my research on astrophysical compact objects throughout the last decade. These involve stability of accretion disks and analytic and numerical treatment of radiation in general relativity. I will highlight my recent work on the Event Horizon Telescope project, from designing the data processing pipeline, through investigating consistency with the archival observations, all the way to the theoretical interpretations and testing Kerr paradigm. I will also outline several exciting projects that are nearing completion, as well as some future plans.