Modal metaphysics consumed much of the philosophical discussion at the turn of the century, yielding a number of epistemological insights. Modal analyses were applied within epistemology, yielding sensitivity and safety theories of knowledge as well as counterfactual accounts of the basing relation. The contemporary conversation has now turned to a new metaphysical notion -- grounding -- opening the way to insights by bringing grounding into epistemology. In this dissertation, I attempt to apply insights about grounding within epistemology, opening up a new fruitful exchange between metaphysicians and epistemologists.Release after 07/15/202