The Essential Charles Eastman (Ohiyesa) (2007, World Wisdom) is a compilation of the writings of Charles Eastman. A 19th-century Native American author and activist, Eastman lived both in the world of the Santee Dakota and the world of contemporary non-Indian America. His writings are of historical significance, providing a glimpse of Native American life during a turbulent time, as well as an explanation of the spiritual traditions of the Sioux people.