I was studying discrete mathematics with a book that had mini biographies of the mathematicians that worked on wharever was being explain on that section. And it had one of them, who considered mathematics an art at the same level as painting or sculpting and hated that mathematicians "lower" themselves to do math that were "useful", like nobody expects the same "useful results" from the art department. This guy worked really hard to only research on pure mathematics and the most "useless" branch of it, number theory. Eventually, his work helped build the necessary mathematics background to make encryption a thing, and now the entire society use his research. It's a shame I can't remember the name of the guy.