>>11201319he revolutionized a field of math called algebraic geometry. It's high level shit that doesn't make much sense to me yet, but since applications seem to be whats important to you, "Algebraic geometry now finds applications in statistics, control theory, robotics, error-correcting codes, phylogenetics and geometric modelling. There are also connections to string theory, game theory, graph matchings, solitons and integer programming." -wikipedia
And idk if he's really the Einstein of math, there both brilliant but not really brilliant in any similar ways. Hell, Einstein probably doesn't deserve to be as well known as he is. The vast majority of people know his name but have nothing close to a legitimate understanding of what Einstein did, so not sure why he is worshiped so much.