Ohiyesa (Charles A. Eastman) (1858–1939) was a Dakota Sioux writer, physician, educator, and reformer, and one of the first Indigenous American authors to gain a wide readership in English. Born in present-day Minnesota, he spent his early childhood within traditional Dakota society before being sent to mission schools and later studying at Dartmouth College and Boston University, where he trained as a physician. Eastman worked as a doctor, lecturer, and advocate for Native American rights, while also writing extensively about Indigenous life and history. His best-known books include Indian Boyhood (1902), Old Indian Days (1907), and From the Deep Woods to Civilization (1916). Drawing on both Dakota oral traditions and his experiences in Euro-American society, Eastman sought to preserve Indigenous knowledge and challenge popular stereotypes about Native peoples. His work occupies a unique place between autobiography, storytelling, history, and cultural translation, offering one of the earliest Native-authored accounts of Indigenous life in North America.