Charles Alexander Eastman, né Hakadah le , (plus tard nommé Ohíye S’a), et mort le est un médecin du Santee Dakota qui a étudié à l'Université de Boston, et est également écrivain, conférencier national et réformateur.
Indian Child Life, nonfiction, Little, Brown, 1913.
Indian Scout Talks: A Guide for Scouts and Campfire Girls, nonfiction, Little, Brown, 1914. (retitled Indian Scout Craft and Lore, Dover Publications). A 1914 reviewer writes, "If one should follow this guide, one would soon begin to doubt he is a white man"[2].
The Indian Today: The Past and Future of the Red American, Doubleday-Page, 1915.
From the Deep Woods to Civilization: Chapters in the Autobiography of an Indian, autobiography; Little, Brown, 1916.