Hari Seldon is a fictional character from Isaac Asimov's science fiction series, particularly known for his role in the Foundation series. He is a brilliant mathematician who develops a field called psychohistory, which uses mathematical equations to predict the future of large populations. Seldon's work aims to save humanity from a dark age by guiding the development of civilization. Seldon foresees the fall of the Galactic Empire and establishes a plan to shorten the ensuing chaos. He creates the Foundation, a group of scientists and scholars tasked with preserving knowledge and culture. Through his foresight, Seldon becomes a pivotal figure in shaping the future of the galaxy.